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Note 11 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance at beginning of period $ 1,606 $ 1,752 $ 1,545 $ 1,769
Change in accruals for warranties during the period 71 213 156 317
Settlements during the period (36) (205) (60) (326)
Balance at end of period $ 1,641 $ 1,760 $ 1,641 $ 1,760