Note 8 - Goodwill and Intangible Assets - Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Developed Technology Rights [Member]
Gross Intangible Assets	$ 16,947	$ 16,304
Accumulated Amortization	8,881	8,084
Net Intangible Assets	8,066	8,220
Customer Relationships [Member]
Gross Intangible Assets	14,173	13,020
Accumulated Amortization	11,963	11,290
Net Intangible Assets	2,210	1,730
In Process Research and Development [Member]
Gross Intangible Assets	$ 598
Accumulated Amortization
Net Intangible Assets	$ 598
Order or Production Backlog [Member]
Gross Intangible Assets	7,284	7,155
Accumulated Amortization	7,198	$ 7,155
Net Intangible Assets	86
Other Intangible Assets [Member]
Gross Intangible Assets	1,608	$ 1,608
Accumulated Amortization	1,241	1,174
Net Intangible Assets	367	434
Gross Intangible Assets	40,610	38,087
Accumulated Amortization	29,283	27,703
Net Intangible Assets	$ 11,327	$ 10,384