Note 7 - Goodwill and Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Developed Technology Rights [Member]
Gross Intangible Assets	$ 17,309	$ 16,304
Accumulated Amortization	11,639	8,084
Net Intangible Assets	5,670	8,220
Customer Relationships [Member]
Gross Intangible Assets	13,520	13,020
Accumulated Amortization	12,961	11,290
Net Intangible Assets	559	1,730
Contract Backlog [Member]
Gross Intangible Assets	7,329	7,155
Accumulated Amortization	$ 7,329	$ 7,155
Net Intangible Assets
In Process Research and Development [Member]
Gross Intangible Assets	$ 1,188
Accumulated Amortization
Net Intangible Assets	$ 1,188
Other Intangible Assets [Member]
Gross Intangible Assets	1,599	$ 1,608
Accumulated Amortization	1,409	1,174
Net Intangible Assets	190	434
Gross Intangible Assets	40,945	38,087
Accumulated Amortization	33,338	27,703
Net Intangible Assets	$ 7,607	$ 10,384