Note 3 - Equipment and Leasehold Improvements, Net (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Capital Leased Assets, Gross	$ 373,000	$ 314,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	106,000	41,000
Gain (Loss) on Disposition of Assets	(63,000)	(11,000)	$ (96,000)
Depreciation, Depletion and Amortization	1,978,000	1,520,000	1,243,000
Interest Costs Capitalized	$ 0	$ 173,000	$ 228,000