CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 29,000	$ (1,176,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Share-based compensation expense	56,000	152,000
Bond premium amortization	6,000	1,000
Depreciation and amortization	140,000	141,000
Loss on sale of marketable securities	2,000	0
Changes in operating assets and liabilities:
Accounts receivable	1,186,000	960,000
Inventories	568,000	(2,055,000)
Costs and estimated earnings in excess of billings on uncompleted contracts	(124,000)	(43,000)
Other current assets	78,000	66,000
Other assets	29,000	4,000
Accounts payable	(200,000)	34,000
Accrued expenses	(53,000)	(286,000)
Income taxes payable	21,000	(30,000)
Customer advances	(61,000)	0
Liability associated with non-renewal of senior officers' contracts	(218,000)	701,000
Net cash provided by (used in) operating activities	1,459,000	(1,531,000)
Cash flows from investing activities:
Purchase of property and equipment	(156,000)	(281,000)
Purchase of marketable securities	(151,000)	0
Sale of marketable securities	150,000	0
Net cash used in investing activities	(157,000)	(281,000)
Cash flows from financing activities:
Purchase of treasury stock	(325,000)	(402,000)
Proceeds from issuance of long-term debt	0	65,000
Proceeds from issuance of note payable-bank	0	1,407,000
Restricted cash	0	671,000
Repayments of note payable - bank	(724,000)	0
Repayments of long-term debt	(16,000)	(473,000)
Net cash (used in) provided by financing activities	(1,065,000)	1,268,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	237,000	(544,000)
Cash and cash equivalents - Beginning of period	610,000	1,709,000
CASH AND CASH EQUIVALENTS - End of period	847,000	1,165,000
Supplemental cash flow information:
Cash paid for interest	34,000	72,000
Cash paid for income taxes	$ 25,000	$ 92,000