Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 4,530,000	$ 3,211,000
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	610,000	746,000
Non cash interest expense included in net income	46,000	46,000
Share based compensation expense	328,000	387,000
Bad debt expense	24,000	146,000
Inventory reserve expense	82,000	149,000
Changes in operating assets and liabilities:
Accounts receivable	4,720,000	6,565,000
Costs and estimated earnings in excess of billings on uncompleted contracts	3,786,000	(2,224,000)
Inventories	(228,000)	(1,098,000)
Prepaid expense and other current assets	(633,000)	(310,000)
Deferred charges and other assets	181,000	153,000
Accounts payable and accrued expenses	(2,702,000)	(2,704,000)
Billings in excess of costs and estimated earnings on uncompleted contracts	(2,941,000)	(2,314,000)
Income taxes payable	879,000	(488,000)
Other liabilities	(124,000)	155,000
Net cash provided by operating activities	8,558,000	2,420,000
Cash flows from investing activities:
Acquisitions of property and equipment	(132,000)	(256,000)
Net proceeds from sale of plant and equipment		526,000
Net cash (used in) provided by investing activities	(132,000)	270,000
Cash flows from financing activities:
Net borrowings on revolving credit line		317,000
Proceeds from exercise of stock options	110,000	71,000
Cash paid for repurchase of common shares	(456,000)	(431,000)
Dividends paid to common shareholders	(1,025,000)
Net cash used in financing activities	(1,371,000)	(43,000)
Net increase in cash and cash equivalents	7,055,000	2,647,000
Cash and cash equivalents at beginning of period	12,724,000	5,792,000
Cash and cash equivalents at end of period	19,779,000	8,439,000
Supplemental Schedule of Non-Cash Activities:
Conversion of subordinated debt to common stock	440,000	200,000
Cash paid during the period for:
Interest	606,000	667,000
Income taxes	$ 1,242,000	$ 2,824,000