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Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 493,734 $ 117,022
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 243,996 243,244
Net gain on disposal of property and equipment (30,000) (1,990)
Deferred income taxes (14,000) (31,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (1,811,766) (1,035,849)
Inventories, net 146,594 (490,373)
Other current assets 24,428 30,656
Accounts payable 282,297 749,714
Accrued wages and salaries 278,469 168,693
Other accrued expenses 78,395 (61,107)
Unearned revenue and customer deposits (61,549) (19,681)
Net cash provided by operating activities (369,402) (330,671)
Cash flows from investing activities:    
Capital expenditures (102,156) (240,914)
Proceeds from the sale of property and equipment 30,000 1,990
Proceeds from certificates of deposit 1,147,000 850,000
Purchases of certificates of deposit (1,065,000) (298,000)
Net cash provided by investing activities 9,844 313,076
Cash flows from financing activities:    
Cash dividends paid (144,920) (115,936)
Net cash used in financing activities (144,920) (115,936)
Net decrease in cash and cash equivalents (504,478) (133,531)
Cash and cash equivalents at beginning of period 704,345 725,524
Cash and cash equivalents at end of period 199,867 591,993
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 34,609 $ 63,366