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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 2,045 $ 1,258
Adjustment to reconcile net income to net cash provided operating activities:    
Depreciation and amortization 318 377
Non cash interest expense included in net income 23 23
Share based compensation expense 154 252
Bad debt expense 21 79
Inventory reserve expense 56 78
Changes in operating assets and liabilities:    
Accounts receivable 2,790 1,826
Costs and estimated earnings in excess of billings on uncompleted contracts 4,369 (591)
Inventories (270) (481)
Prepaid expense and other current assets 509 (71)
Deferred charges and other assets 179 179
Accounts payable and accrued expenses (2,452) (933)
Billings in excess of costs and estimated earnings on uncompleted contracts (609) (813)
Income taxes payable 414 (489)
Other liabilities 121 103
Net cash provided by operating activities 7,668 797
Cash flows from investing activities:    
Acquisitions of property and equipment (73) (160)
Net proceeds from sale of plant and equipment   526
Net cash (used in) provided by investing activities (73) 366
Cash flows from financing activities:    
Net repayments of revolving credit line   113
Proceeds from exercise of stock options 53 59
Cash paid for repurchase of common shares   (431)
Dividends paid to common shareholders (512)  
Net cash used in financing activities (459) (259)
Net increase in cash and cash equivalents 7,136 904
Cash and cash equivalents at beginning of period 12,724 5,792
Cash and cash equivalents at end of period 19,860 6,696
Supplemental Schedule of Non-Cash Activities:    
Conversion of subordinated debt to common stock 200 200
Cash paid during the period for:    
Interest 421 428
Income taxes $ 105 $ 1,695