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Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 453,532 $ 493,734
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 265,581 243,996
Gain on disposal of equipment   (30,000)
Deferred income taxes (84,000) (14,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (1,285,084) (1,811,766)
Inventories, net (348,120) 146,594
Other current assets 104,329 24,428
Accounts payable 499,342 282,297
Accrued wages and salaries 246,031 278,469
Other accrued expenses 14,827 78,395
Unearned revenue and customer deposits (11,209) (61,549)
Net cash used in operating activities (144,771) (369,402)
Cash flows from investing activities:    
Capital expenditures (50,988) (102,156)
Proceeds from the sale of equipment   30,000
Proceeds from certificates of deposit 2,450,000 1,147,000
Purchases of certificates of deposit (747,000) (1,065,000)
Net cash provided by investing activities 1,652,012 9,844
Cash flows from financing activities:    
Cash dividends paid (144,920) (144,920)
Net cash used in financing activities (144,920) (144,920)
Net increase (decrease) in cash and cash equivalents 1,362,321 (504,478)
Cash and cash equivalents at beginning of period 392,810 704,345
Cash and cash equivalents at end of period 1,755,131 199,867
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 31,602 $ 34,609