Note 7 - Goodwill and Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Net intangible assets	$ 2,984	$ 7,607
Gross intangible assets	40,937	40,945
Accumulated Impairment	1,391
Accumulated amortization	36,562	33,338
Developed Technology Rights [Member]
Net intangible assets	2,876	5,670
Gross intangible assets	17,309	17,309
Accumulated Impairment	265
Accumulated amortization	14,168	11,639
Customer Relationships [Member]
Net intangible assets		559
Gross intangible assets	13,520	13,520
Accumulated Impairment	123
Accumulated amortization	13,397	12,961
In Process Research and Development [Member]
Net intangible assets		1,188
Gross intangible assets	1,188	1,188
Accumulated Impairment	1,003
Accumulated amortization	185
Contract Backlog [Member]
Net intangible assets
Gross intangible assets	7,329	7,329
Accumulated Impairment
Accumulated amortization	7,329	7,329
Other Intangible Assets [Member]
Net intangible assets	108	190
Gross intangible assets	1,591	1,599
Accumulated Impairment
Accumulated amortization	$ 1,483	$ 1,409