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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 568,373 $ 453,532
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation 305,326 265,581
Gain on the sale of equipment (17,000)  
Deferred income taxes 7,000 (84,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (947,840) (1,285,084)
Inventories, net (272,644) (348,120)
Other current assets (23,971) 104,329
Accounts payable 855,106 499,342
Accrued wages and salaries 220,394 246,031
Other accrued expenses (16,974) 14,827
Unearned revenue and customer deposits (50,360) (11,209)
Net cash provided by (used in) operating activities 627,410 (144,771)
Cash flows from investing activities:    
Capital expenditures (537,588) (50,988)
Proceeds from the sale of equipment 17,000  
Proceeds from certificates of deposit 1,245,000 2,450,000
Purchases of certificates of deposit (498,000) (747,000)
Net cash used in investing activities 226,412 1,652,012
Cash flows from financing activities:    
Cash dividends paid (560,357) (144,920)
Net cash used in financing activities (560,357) (144,920)
Net increase in cash and cash equivalents 293,465 1,362,321
Cash and cash equivalents at beginning of year 443,608 392,810
Cash and cash equivalents at end of year 737,073 1,755,131
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 13,030 $ 31,602