NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTS RECEIVABLE, UNBILLED COSTS AND FEES, AND INVENTORIES (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
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	$ 5,489,000	$ 6,696,000
Inventories
Raw materials, completed sub-assemblies and spare parts	19,605,000	20,334,000
Work-in-process	14,847,000	17,853,000
Finished goods	3,988,000	2,796,000
Total	38,440,000	40,983,000
Allowance for doubtful accounts
Activity
Balance at Beginning of Year	333,000	323,000	$ 351,000
Charged to Costs and Expenses	472,000	10,000	(27,000)
Deductions or Write-offs Charged to Reserves	8,000		1,000
Balance at End of Year	797,000	333,000	323,000
Reserve for excess or obsolete inventory
Activity
Balance at Beginning of Year	8,294,000	10,865,000	11,052,000
Charged to Costs and Expenses	748,000	664,000	1,355,000
Deductions or Write-offs Charged to Reserves	664,000	3,235,000	1,542,000
Balance at End of Year	$ 8,378,000	$ 8,294,000	$ 10,865,000