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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 1,137,427 $ 1,091,745
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 618,736 530,819
Gain on the sale of equipment (18,700) (42,486)
Deferred income taxes (22,000) (80,000)
Changes in operating assets and liabilities:    
Accounts receivable, net (683,329) (1,223,208)
Inventories, net (333,437) (55,880)
Other current assets (34,410) 154,201
Accounts payable 512,700 280,255
Accrued wages and salaries 278,018 345,754
Other accrued expenses (129,411) 165,409
Unearned revenue and customer deposits (71,339) 112,706
Net cash provided by operating activities 1,254,255 1,279,315
Cash flows from investing activities:    
Capital expenditures (765,051) (1,775,255)
Proceeds from the sale of equipment 18,700 90,200
Proceeds from certificates of deposit 1,842,248 4,765,000
Purchases of certificates of deposit (996,000) (3,585,248)
Net cash used in investing activities 99,897 (505,303)
Cash flows from financing activities:    
Cash dividends paid (734,260) (289,839)
Net cash used in financing activities (734,260) (289,839)
Net increase in cash and cash equivalents 619,892 484,173
Cash and cash equivalents at beginning of year 443,608 392,810
Cash and cash equivalents at end of year 1,063,500 876,983
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 35,036 $ 199,694