Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Details)

Intangible Assets (Details) (USD $)	12 Months Ended
Intangible Assets (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Intangible Assets
Intangible Assets, Gross	$ 8,196,000	$ 8,196,000
Accumulated Amortization	6,859,000	6,406,000
Total expected future amortization	1,337,000	1,790,000
Amortization expense	500,000us-gaap_AmortizationOfIntangibleAssets	500,000us-gaap_AmortizationOfIntangibleAssets	500,000us-gaap_AmortizationOfIntangibleAssets
Expected future amortization expense of intangible assets
2016	332,000
2017	352,000
2018	242,000
2019	224,000
2020	187,000
Total expected future amortization	1,337,000	1,790,000
Manufacturing license
Intangible Assets
Weighted Average Amortization Period	17 years	17 years
Intangible Assets, Gross	3,700,000	3,700,000
Accumulated Amortization	3,585,000	3,536,000
Total expected future amortization	115,000	164,000
Expected future amortization expense of intangible assets
Total expected future amortization	115,000	164,000
Technology
Intangible Assets
Weighted Average Amortization Period	10 years	10 years
Intangible Assets, Gross	2,240,000	2,240,000
Accumulated Amortization	1,157,000	933,000
Total expected future amortization	1,083,000	1,307,000
Expected future amortization expense of intangible assets
Total expected future amortization	1,083,000	1,307,000
Parts and service customer relationships
Intangible Assets
Weighted Average Amortization Period	5 years	5 years
Intangible Assets, Gross	1,080,000	1,080,000
Accumulated Amortization	1,080,000	900,000
Total expected future amortization		180,000
Expected future amortization expense of intangible assets
Total expected future amortization		180,000
TA100 customer relationships
Intangible Assets
Weighted Average Amortization Period	2 years	2 years
Intangible Assets, Gross	617,000	617,000
Accumulated Amortization	617,000	617,000
Backlog
Intangible Assets
Intangible Assets, Gross	490,000	490,000
Accumulated Amortization	351,000	351,000
Total expected future amortization	139,000	139,000
Expected future amortization expense of intangible assets
Total expected future amortization	139,000	139,000
Trade name
Intangible Assets
Weighted Average Amortization Period	1 year 2 months 12 days	1 year 2 months 12 days
Intangible Assets, Gross	69,000	69,000
Accumulated Amortization	$ 69,000	$ 69,000