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7. FINANCIAL INSTRUMENTS - Change in contingent consideration (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Changes in fair value of contingent consideration      
Contingent consideration, beginning of period $ 3,898 $ 4,206 $ 5,514
Change due to accretion 98 112 147
Re-measurement of contingent consideration 229 80 (326)
Payment of contingent consideration   (500) (1,129)
Contingent consideration, end of period $ 4,225 $ 3,898 $ 4,206