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7. FINANCIAL INSTRUMENTS - Change in contingent consideration (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Changes in fair value of contingent consideration      
Contingent consideration, beginning of period $ 4,206 $ 5,514 $ 6,200
Change due to accretion 112 147 158
Re-measurement of contingent consideration 80 (326) (466)
Payment of contingent consideration (500) (1,129) (378)
Contingent consideration, end of period $ 3,898 $ 4,206 $ 5,514