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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 2,302 $ 7,514
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,943 5,389
Loss (gain) on sale of property and equipment 225 (13)
Non-cash interest expense included in net income 323 275
Share-based compensation expense 854 750
Bad debt expense 69 82
Inventory reserve expense 256 308
Deferred income taxes (894)  
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (7,442) 2,984
Costs and estimated earnings in excess of billings on uncompleted contracts (7,439) (4,105)
Inventories 408 794
Prepaid expense and other current assets 181 (1,560)
Deferred charges and other assets 361 80
Accrued litigation settlement   (2,536)
Accounts payable and accrued expenses 2,704 (5,263)
Billings in excess of costs and estimated earnings on uncompleted contracts (420) (2,167)
Income taxes payable 354 (794)
Other liabilities 1,165 33
Net cash (used in) provided by operating activities (50) 1,771
Cash flows from investing activities:    
Acquisitions of property and equipment (341) (711)
Proceeds from sale of property and equipment 2,396 7,124
Net cash provided by investing activities 2,055 6,413
Cash flows from financing activities:    
Net borrowings (repayments) on revolving credit lines 3,469 (4,675)
Repayments of debt (4,452) (5,427)
Proceeds from employee stock purchase plan and exercise of stock options 195 844
Repurchases of common stock   (973)
Dividends paid to common shareholders (3,490) (2,826)
Net cash used in financing activities (4,278) (13,057)
Net decrease in cash and cash equivalents (2,273) (4,873)
Cash and cash equivalents at beginning of period 19,362 22,661
Cash and cash equivalents at end of period 17,089 17,788
Cash paid during the period for:    
Interest 1,785 1,505
Income taxes $ 595 $ 5,903