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Note 4 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Total stock-based compensation expense $ 839 $ 590 $ 2,597 $ 1,236
Cost of Sales [Member]        
Total stock-based compensation expense (23) 21 35 45
Research and Development Expense [Member]        
Total stock-based compensation expense 179 117 470 219
Selling, General and Administrative Expenses [Member]        
Total stock-based compensation expense $ 683 $ 452 $ 2,092 $ 971