Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Expense (Benefit)	$ 11,000	$ 26,000	$ 21,000	$ (24,000)
Effective Income Tax Rate Reconciliation, Percent	2.20%	21.00%	2.10%	(3.90%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%		34.00%
Unrecognized Tax Benefits	$ 0		$ 0