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Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]      
Cash (receipts) for interest, net $ (87) $ (371) $ (329)
Cash payments for income tax, net 459 694 409
Acquisition of property and equipment under lease obligations   17  
Accrued capital expenditures $ 103 $ 187 $ 56
Leasehold improvements acquired under operating lease arrangement 0 0 62