Note 15 - Income Taxes - Components of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Federal	$ 3	$ 4	$ 112
State	(12)	(21)	(2)
Total current (expense) benefit	(9)	(17)	110
Federal
State
Total deferred expense
Income tax (expense) benefit	$ (9)	$ (17)	$ 110