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Note 6 - Balance Sheet Details - Property, Plant and Equipment (Details) (Parentheticals)	12 Months Ended
	Mar. 31, 2017
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	24 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	50 years
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	8 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	40 years