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Consolidated Statements of Cash Flow (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net income $ 1,745,741 $ 1,254,877
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 993,951 971,496
Net gain on disposal of property and equipment (67,946) (192,544)
Deferred income taxes 171,000 14,000
Changes in operating assets and liabilities:    
Accounts receivable, net (179,506) (381,345)
Inventories, net 275,668 (901,886)
Other current assets (74,595) 5,280
Accounts payable (59,606) 130,235
Accrued wages and salaries 34,731 (30,640)
Other accrued expenses 6,651 141,471
Unearned revenue and customer deposits (66,747) 66,954
Net cash provided by operating activities 2,779,342 1,077,898
Cash flows from investing activities:    
Capital expenditures (1,092,759) (1,522,539)
Proceeds from the sale of property and equipment 79,400 416,190
Proceeds from certificates of deposit 5,160,000 5,630,000
Purchases of certificates of deposit (6,368,000) (5,130,000)
Net cash used in investing activities (2,221,359) (606,349)
Cash flows from financing activities:    
Cash dividends paid (869,518) (492,728)
Net cash used in financing activities (869,518) (492,728)
Net decrease in cash and cash equivalents (311,535) (21,179)
Cash and cash equivalents at beginning of period 704,345 725,524
Cash and cash equivalents at end of period 392,810 704,345
Net cash paid for income taxes 812,298 490,846
Supplemental schedule of non-cash investing activities:    
Capital expenditures in accounts payable $ 94,987 $ 89,250