CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net (loss) income	$ (135,000)	$ 3,147,000
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Goodwill impairment	820,000	0
Share-based compensation expense	211,000	152,000
Depreciation and amortization	288,000	270,000
Bond premium amortization	2,000	1,000
Loss of fixed asset disposal	0	8,000
Gain on sale of marketable securities	(5,000)	(45,000)
Deferred income	0	(86,000)
Changes in operating assets and liabilities:
Increase in accounts receivable	(431,000)	(1,014,000)
Increase in inventories	(721,000)	(923,000)
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts	(875,000)	468,000
(Increase) decrease in other current assets	(2,000)	793,000
(Increase) decrease in other assets	(26,000)	7,000
Increase (decrease) in liability associated with non-renewal of senior officer's contracts	79,000	(1,065,000)
(Decrease) increase in accounts payable	(63,000)	10,000
Increase (decrease) in customer advances	73,000	(103,000)
(Decrease) increase in taxes payable	(28,000)	30,000
(Decrease) increase in accrued expenses	(141,000)	299,000
Net cash (used in) provided by operating activities	(954,000)	1,949,000
Cash flows from investing activities:
Proceeds from sale of marketable securities	113,000	156,000
Purchase of property and equipment	(373,000)	(130,000)
Purchase of marketable securities	(110,000)	(252,000)
Sale of property and equipment	0	6,000
Proceeds on disposal of property and equipment	0	4,000
Net cash used in investing activities	(370,000)	(216,000)
Cash flows from financing activities:
Restricted cash	671,000	(671,000)
Purchase of treasury stock	(785,000)	0
Repayments of long-term debt	(3,050,000)	(931,000)
Proceeds from issuance of note payable-bank	3,324,000	(387,000)
Proceeds from issuance of long-term debt	65,000	0
Proceeds from exercise of stock options	0	1,000
Net cash provided by (used in) financing activities	225,000	(1,988,000)
Net decrease in cash and cash equivalents	(1,099,000)	(255,000)
Cash and cash equivalents at beginning of year	1,709,000	1,964,000
Cash and cash equivalents at end of year	610,000	1,709,000
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	130,000	193,000
Cash paid during the year for income taxes	$ 98,000	$ 57,000