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Note 3 - Stock-based Compensation - Stock-based Compensation Expense By Financial Statement Line Item (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Total stock-based compensation expense $ 590 $ 792 $ 1,236 $ 2,402
Cost of Sales [Member]        
Total stock-based compensation expense 21 42 45 132
Research and Development Expense [Member]        
Total stock-based compensation expense 117 168 219 289
Selling, General and Administrative Expenses [Member]        
Total stock-based compensation expense $ 452 $ 582 $ 971 $ 1,981