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Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.","units":{"USD":[{"start":"2015-01-01","end":"2015-03-31","val":49000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-01-01","end":"2015-03-31","val":49000,"accn":"0001214659-17-002018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2015Q1"},{"start":"2015-04-01","end":"2015-06-30","val":146000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-04-01","end":"2015-06-30","val":146000,"accn":"0001214659-17-002018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2015Q2"},{"start":"2015-07-01","end":"2015-09-30","val":548000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-07-01","end":"2015-09-30","val":548000,"accn":"0001214659-17-002018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2015Q3"},{"start":"2015-10-01","end":"2015-12-31","val":1819000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-10-01","end":"2015-12-31","val":1819000,"accn":"0001214659-17-002018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2015Q4"},{"start":"2016-01-01","end":"2016-03-31","val":139000,"accn":"0001214659-17-002018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-16","frame":"CY2016Q1"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":2381000,"accn":"0001214659-14-002323","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. 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Payable","description":"Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if 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Issued During Period, Value, Restricted Stock Award, Net of Forfeitures","description":"Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards 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Issued, Value, Share-based Payment Arrangement, after Forfeiture","description":"Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan 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Issued During Period, Value, Stock Options Exercised","description":"Value of stock issued as a result of the exercise of stock 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Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":5000,"accn":"0001214659-14-002323","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28","frame":"CY2008"},{"start":"2008-01-01","end":"2008-12-31","val":-5000,"accn":"0001214659-13-001633","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-26"}]}},"StockRepurchaseProgramAuthorizedAmount":{"label":"Stock Repurchase Program, Authorized Amount (Deprecated 2014-01-31)","description":"Amount of a stock repurchase plan authorized by an entity's Board of Directors.","units":{"USD":[{"start":"2013-03-05","end":"2013-04-05","val":18500000,"accn":"0001214659-14-002323","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"}]}},"StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1":{"label":"Stock Repurchase Program, Remaining Authorized Repurchase Amount","description":"Amount remaining of a stock repurchase plan authorized.","units":{"USD":[{"end":"2015-07-31","val":6000000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14","frame":"CY2015Q2I"},{"end":"2015-12-31","val":3200000,"accn":"0001214659-16-010295","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14","frame":"CY2015Q4I"}]}},"UnamortizedDebtIssuanceExpense":{"label":"Unamortized Debt Issuance Expense","description":"The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or 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