CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (80,000)	$ (1,375,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Share-based compensation expense	28,000	52,000
Depreciation and amortization	68,000	66,000
Loss on sale of marketable securities	2,000	0
Bond premium amortization	1,000	1,000
Changes in operating assets and liabilities:
Accounts receivable	1,305,000	1,255,000
Inventories	343,000	(1,491,000)
Costs and estimated earnings in excess of billings on uncompleted contracts	(9,000)	0
Other current assets	18,000	31,000
Other assets	14,000	2,000
Accounts payable	41,000	549,000
Accrued expenses	(165,000)	(331,000)
Income taxes payable	2,000	(30,000)
Income taxes receivable	0	(8,000)
Customer advances	(71,000)	11,000
Liability associated with non-renewal of senior officers' contracts	(106,000)	730,000
Net cash provided by (used in) operating activities	1,391,000	(538,000)
Cash flows from investing activities:
Purchases of property and equipment	(128,000)	(147,000)
Purchase of marketable securities	(156,000)	(4,000)
Sale of marketable securities	150,000	0
Net cash used in investing activities	(134,000)	(151,000)
Cash flows from financing activities:
Purchase of treasury stock	(56,000)	(402,000)
Proceeds from issuance of long-term debt	0	66,000
Repayments of note payable - bank	(624,000)	0
Restricted cash	0	(1,000)
Repayments of long-term debt	(8,000)	(233,000)
Net cash used in financing activities	(688,000)	(570,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	569,000	(1,259,000)
Cash and cash equivalents - Beginning of period	610,000	1,709,000
CASH AND CASH EQUIVALENTS - End of period	1,179,000	450,000
Supplemental cash flow information:
Cash paid for interest	18,000	35,000
Cash paid for income taxes	$ 24,000	$ 68,000