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Note 6 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Depreciation, Total $ 2,959 $ 2,234 $ 2,338
GPT Acquisition [Member]      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment $ 878