Note 7 Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 14,087	$ 14,087
Accumulated Amortization	10,070	8,943
Net Intangible Assets	4,017	5,144
Developed Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	4,800	4,800
Accumulated Amortization	2,058	1,658
Net Intangible Assets	2,742	3,142
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	6,100	6,100
Accumulated Amortization	5,471	4,840
Net Intangible Assets	629	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	541	445
Net Intangible Assets	$ 646	$ 742