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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Reconciliation of net income to cash provided by operating activities    
Net income (loss) $ (298,555) $ 86,156
Adjustments to reconcile net income (loss) to net cash provided (absorbed) by operating activities:    
Depreciation and amortization 312,066 332,040
Gain on disposal of fixed assets (34,079) (18,282)
Deferred taxes (47,000) (69,000)
(Increase) decrease in:    
Accounts receivable - billed 748,418 (2,555,349)
Accounts receivable - unbilled (164,166) 659,995
Inventories 410,994 123,776
Prepaid expenses and other assets (276,288) 92,866
Prepaid income taxes 89,303 81,750
Increase (decrease) in:    
Accounts payable - trade (116,661) 273,541
Accrued expenses and other (54,650) 13,160
Accrued income taxes payable (302,263) 0
Customer deposits (203,881) 237,947
Net cash provided (absorbed) by operating activities 63,238 (741,400)
Cash flows from investing activities:    
Purchases of investment securities available-for-sale (36,217) (1,985,377)
Purchases of property and equipment (217,599) (245,138)
Proceeds from sale of fixed assets 35,619 18,282
Net cash absorbed by investing activities (218,197) (2,212,233)
Cash flows from financing activities:    
Proceeds from long-term borrowings 55,160 39,898
Repayments of long-term borrowings (187,700) (169,386)
Proceeds from options exercised 0 8,431
Net cash absorbed by financing activities (132,540) (121,057)
Net decrease in cash and cash equivalents (287,499) (3,074,690)
Cash and cash equivalents    
Beginning of period 3,136,063 4,367,474
End of period $ 2,848,564 $ 1,292,784