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Condensed Consolidated Statements of Cash Flow (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 1,397,508 $ 1,022,183
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 743,650 723,368
Net gain on disposal of property and equipment (57,500) (189,863)
Deferred income taxes (21,000) (55,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (1,054,767) (1,318,724)
Inventories, net (2,721) (518,783)
Other current assets (18,162) (25,464)
Accounts payable 261,013 346,128
Accrued wages and salaries 472,762 389,047
Other accrued expenses 40,982 164,938
Unearned revenue and customer deposits (26,030) 13,915
Net cash provided by operating activities 1,735,735 551,745
Cash flows from investing activities:    
Capital expenditures (580,032) (993,200)
Proceeds from the sale of property and equipment 57,500 413,190
Proceeds from certificates of deposit 4,200,000 4,230,000
Purchases of certificates of deposit (4,376,282) (4,170,000)
Net cash used in investing activities (698,814) (520,010)
Cash flows from financing activities:    
Cash dividends paid (434,760) (347,807)
Net cash used in financing activities (434,760) (347,807)
Net increase (decrease) in cash and cash equivalents 602,161 (316,072)
Cash and cash equivalents at beginning of period 704,345 725,524
Cash and cash equivalents at end of period 1,306,506 409,452
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable   $ 10,555