NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenue Recognition
Retainages	$ 40,000	$ 36,000
Commercial contract retentions and government contract withholdings as a percent of fees	15.00%
Warranty Costs
Parts and labor warranty period for certain of the company's products with purchase of domestic equipment	1 year
Parts only or parts and labor warranty period for certain of the products with purchase of international equipment	1 year
Deferred Revenue
Minimum period covered under extended warranty and service contracts	1 year
Maximum period covered under extended warranty and service contracts	5 years
Impairment of Long-Lived Assets
Impairment costs	0	0	0
Accrued Salaries and Benefits
Accrued payroll and payroll related taxes	1,145,000	2,154,000
Accrued incentive compensation	3,849,000	6,360,000
Accrued vacation	1,775,000	1,885,000
Accrued severance		406,000
Total accrued salaries and benefits	6,769,000	10,805,000
Other Current Liabilities
Accounts payable and other accrued expenses	3,277,000	2,196,000
Accrued contract related costs	1,736,000	4,904,000
Accrued audit and legal fees	433,000	361,000
Accrued sales commissions	290,000	1,831,000
Other Liabilities, Current, Total	5,736,000	9,292,000
Research and Development
Research and development costs	23,390,000	22,089,000	23,618,000
Revenue recognized related to government and customer-sponsored research and development	918,000	698,000	2,124,000
Income per Common and Potential Common Shares
Common stock equivalents excluded from diluted earnings per share as their effect is anti-dilutive (in shares)	211,000	176,000	182,000
Earnings per Share - Basic:
Net income	979,000	15,117,000	17,454,000
Less: Distributed and undistributed earnings (losses) to unvested restricted stock units	2,000	(44,000)
Distributed and undistributed earnings to common shareholders - Basic	$ 981,000	$ 15,073,000	$ 17,454,000
Weighted average number of common shares outstanding - basic (in shares)	7,723,000	7,846,000	8,394,000
Income per share - Basic (in dollars per share)	$ 0.13	$ 1.92	$ 2.08
Earnings per Share - Diluted:
Weighted average number of common shares outstanding - basic (in shares)	7,723,000	7,846,000	8,394,000
Dilutive effect of stock-based awards (in shares)	6,000	35,000	54,000
Weighted average number of common and potential common shares (in shares)	7,729,000	7,881,000	8,448,000
Income per share - Diluted (in dollars per share)	$ 0.13	$ 1.91	$ 2.07
Minimum
Revenue Recognition
Period of certain long-term, custom-built systems or contract engineering projects	1 year
Maximum
Revenue Recognition
Period of certain long-term, custom-built systems or contract engineering projects	5 years