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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2018-04-01","end":"2019-03-31","val":494000,"accn":"0001002135-20-000020","fy":2020,"fp":"FY","form":"10-K","filed":"2020-06-18","frame":"CY2018"},{"start":"2019-04-01","end":"2019-06-30","val":-1380000,"accn":"0001002135-20-000073","fy":2021,"fp":"Q1","form":"10-Q","filed":"2020-08-14","frame":"CY2019Q2"},{"start":"2019-04-01","end":"2019-09-30","val":-3741000,"accn":"0001002135-20-000100","fy":2021,"fp":"Q2","form":"10-Q","filed":"2020-11-06"},{"start":"2019-04-01","end":"2019-12-31","val":-3467000,"accn":"0001002135-21-000003","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-02-12"},{"start":"2019-04-01","end":"2020-03-31","val":-4588000,"accn":"0001002135-20-000020","fy":2020,"fp":"FY","form":"10-K","filed":"2020-06-18"},{"start":"2019-04-01","end":"2020-03-31","val":-4588000,"accn":"0001002135-21-000011","fy":2021,"fp":"FY","form":"10-K","filed":"2021-05-21","frame":"CY2019"},{"start":"2020-04-01","end":"2020-06-30","val":1048000,"accn":"0001002135-20-000073","fy":2021,"fp":"Q1","form":"10-Q","filed":"2020-08-14","frame":"CY2020Q2"},{"start":"2020-04-01","end":"2020-09-30","val":590000,"accn":"0001002135-20-000100","fy":2021,"fp":"Q2","form":"10-Q","filed":"2020-11-06"},{"start":"2020-04-01","end":"2020-12-31","val":-6113000,"accn":"0001002135-21-000003","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-02-12"},{"start":"2020-04-01","end":"2021-03-31","val":-3985000,"accn":"0001002135-21-000011","fy":2021,"fp":"FY","form":"10-K","filed":"2021-05-21","frame":"CY2020"}]}},"CashDividendsPaidToParentCompanyBy50PercentOrLessOwnedPersons":{"label":"SEC Schedule, 12-04, Cash Dividends Paid to Registrant, 50 Percent or Less Owned Persons","description":"This element represents disclosure of the aggregate cash dividends paid to the entity by 50% or less owned persons accounted for using the equity method.","units":{"USD":[{"start":"2020-10-01","end":"2020-12-31","val":36000,"accn":"0001002135-21-000003","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-02-12"},{"start":"2020-10-01","end":"2020-12-31","val":36000,"accn":"0001002135-21-000011","fy":2021,"fp":"FY","form":"10-K","filed":"2021-05-21","frame":"CY2020Q4"}]}},"CashFDICInsuredAmount":{"label":"Cash, FDIC Insured Amount","description":"The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.","units":{"USD":[{"end":"2017-03-31","val":250000,"accn":"0001002135-17-000037","fy":2017,"fp":"FY","form":"10-K","filed":"2017-05-26","frame":"CY2017Q1I"},{"end":"2018-03-31","val":250000,"accn":"0001002135-18-000018","fy":2018,"fp":"FY","form":"10-K","filed":"2018-05-25","frame":"CY2018Q1I"},{"end":"2019-03-31","val":250000,"accn":"0001002135-19-000017","fy":2019,"fp":"FY","form":"10-K","filed":"2019-05-31","frame":"CY2019Q1I"},{"end":"2020-03-31","val":250000,"accn":"0001002135-20-000020","fy":2020,"fp":"FY","form":"10-K","filed":"2020-06-18","frame":"CY2020Q1I"},{"end":"2021-03-31","val":250000,"accn":"0001002135-21-000011","fy":2021,"fp":"FY","form":"10-K","filed":"2021-05-21","frame":"CY2021Q1I"}]}},"CertificatesOfDepositAtCarryingValue":{"label":"Certificates of Deposit, at Carrying Value","description":"A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. 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