Note 7 Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 14,087	$ 14,087
Accumulated Amortization	9,585	8,943
Net Intangible Assets	4,502	5,144
Developed Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	4,800	4,800
Accumulated Amortization	1,858	1,658
Net Intangible Assets	2,942	3,142
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	6,100	6,100
Accumulated Amortization	5,234	4,840
Net Intangible Assets	866	1,260
Contract Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	2,000	2,000
Accumulated Amortization	2,000	2,000
Net Intangible Assets	0	0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	1,187	1,187
Accumulated Amortization	493	445
Net Intangible Assets	$ 694	$ 742