Note 6 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017
Total principal payments	$ 6,988	$ 7,139
Less current maturities	(624)	(623)
Long-term debt, excluding current maturities	6,364	6,516
Less unamortized debt issuance costs	(259)	(267)
Total long-term debt, net of current maturities and unamortized debt issuance costs	$ 6,105	$ 6,249