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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net income $ 10,850 $ 8,272
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,250 1,399
Non cash interest expense included in net income 227 91
Gain on sale of operating plant and equipment (70)  
Share based compensation expense 662 693
Bad debt expense 176 402
Inventory reserve expense 102 269
Deferred income tax expense 454 513
Changes in operating assets and liabilities, net of acquisition:    
Accounts receivable (5,089) 3,261
Inventories 458 (181)
Costs and estimated earnings in excess of billings on uncompleted contracts 4,823 (2,298)
Prepaid expense and other current assets 527 (330)
Deferred charges and other assets 203 (109)
Accounts payable and accrued expenses 319 (3,676)
Billings in excess of costs and estimated earnings on uncompleted contracts 1,303 1,837
Income taxes payable 465 (1,253)
Other liabilities 169 (152)
Net cash provided by operating activities 16,829 8,738
Cash flows from investing activities:    
Acquisitions of property and equipment (273) (913)
Net cash paid for acquisition (4,000)  
Net proceeds from sale of equipment 382 714
Net cash used in investing activities (3,891) (199)
Cash flows from financing activities:    
Proceeds from exercise of stock options 248 112
Cash paid for repurchase of common shares (456) (991)
Dividends paid to common shareholders (2,460) (728)
Net cash used in financing activities (2,668) (1,607)
Net increase in cash and cash equivalents 10,270 6,932
Cash and cash equivalents at beginning of year 12,724 5,792
Cash and cash equivalents at end of year 22,994 12,724
Supplemental Schedule of Non-Cash Investing and Financing Activities:    
Conversion of subordinated debt to common stock 9,600 1,200
Common stock issued in business acquisition 521  
Cash paid (received) during the year for:    
Interest 946 1,047
Income taxes $ 2,637 $ 4,793