Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0	$ 0		$ 0
Unrecognized Tax Benefits	$ 1,400	1,400		1,400
Unrecognized Tax Benefits, Period Increase (Decrease)				0
Income Tax Expense (Benefit)		$ (36)	$ (35)	(25)	$ (143)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability				7,900
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ (7,900)
Earliest Tax Year [Member]
Open Tax Year				1998
Latest Tax Year [Member]
Open Tax Year				2016
Domestic Tax Authority [Member]
Income Tax Expense (Benefit)				$ (60)