Note 6 - Balance Sheet Details - Property, Plant and Equipment (Details) (Parentheticals)	12 Months Ended
	Mar. 31, 2016
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	24 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	50 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	14 years
Assets Held under Capital Leases [Member]
Property, Plant and Equipment, Useful Life	4 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	8 years