NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Accounts Receivable and Unbilled Costs and Fees
Accounts receivable and unbilled costs and fees attributable to both prime and subcontracts with federal and state governments	$ 12,973,000	$ 13,377,000
Inventories
Raw materials, completed sub-assemblies, and spare parts	21,450,000	23,689,000
Work-in-process	21,129,000	16,705,000
Finished goods	5,472,000	7,785,000
Total	48,051,000	48,179,000
Allowance for doubtful accounts
Activity
Balance at Beginning of Year	255,000	334,000	330,000
Charged to Costs and Expenses	344,000	(79,000)	4,000
Deductions or Write-offs Charged to Reserves	248,000
Balance at End of Year	351,000	255,000	334,000
Reserve for excess or obsolete inventory
Activity
Balance at Beginning of Year	6,210,000	4,882,000	3,982,000
Charged to Costs and Expenses	5,061,000	3,076,000	1,604,000
Deductions or Write-offs Charged to Reserves	219,000	1,748,000	704,000
Balance at End of Year	$ 11,052,000	$ 6,210,000	$ 4,882,000