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Note 1 - Description of Business and Summary of Accounting Policies - Estimated Useful Lives (Details)	12 Months Ended
	Mar. 31, 2018
Equipment [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Equipment [Member] \| Maximum [Member]
Estimated useful lives (Year)	10 years
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated useful lives (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated useful lives (Year)	7 years
Leasehold Improvements [Member] \| Minimum [Member]
Estimated useful lives (Year)	10 years
Leasehold Improvements [Member] \| Maximum [Member]
Estimated useful lives (Year)	25 years