Note 4 - Fair Value (Details Textual)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	$ 0	$ 0
Liabilities, Fair Value Disclosure, Recurring	0	0
Debt, Long-term and Short-term, Combined Amount	$ 78,900,000	$ 87,100,000
Derivative, Number of Instruments Held	0	0