Note 11 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
US	$ 44		$ 42
Foreign	(8)		(17)
Total benefit from income taxes	$ 36	$ 35	$ 25	$ 143