Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Income Tax Expense (Benefit), Total	$ 191	$ (294)	$ 380	$ (83)
Liability for Uncertainty in Income Taxes, Current	$ 0		$ 0
Unrecognized Tax Benefits, Ending Balance					$ 0