Note 6 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Total principal payments	$ 6,835	$ 7,139
Less current maturities	(626)	(623)
Long-term debt, excluding current maturities	6,209	6,516
Less unamortized debt issuance costs	(250)	(267)
Total long-term debt, net of current maturities and unamortized debt issuance costs	$ 5,959	$ 6,249