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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net income $ 5,619,798 $ 2,855,421
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 2,384,411 2,336,794
Loss (gain) on sale of investments, net (71,286) 29,256
Loss on disposition of equipment 11,169 20,135
Impairment of investments 0 36,032
Deferred income taxes (434,896) 68,217
Bad debt expense 435,344 48,240
(Increase) decrease in operating assets:    
Accounts receivable (1,213,253) (1,494,790)
Other receivables 215,379 (119,524)
Inventories (984,711) (969,101)
Refundable income taxes (43,512) 865,432
Prepaid expenses and other current assets (17,508) 78,685
Increase (decrease) in operating liabilities:    
Accounts payable (129,514) 202,758
Accrued expenses 601,952 84,466
Income taxes payable 254,311 0
Net cash provided by operating activities 6,627,684 4,042,021
Cash flows from investing activities:    
Purchases of investments (1,452,672) (2,434,340)
Proceeds from sale of investments 1,475,730 1,810,816
Investments in certificates of deposits (150,255) (50,000)
Purchases of property and equipment (1,428,717) (1,439,133)
Net cash used in investing activities (1,555,914) (2,112,657)
Cash flows from financing activities:    
Proceeds of note payable 250,000 2,000,000
Checks written in excess of bank balances (592,040) (749,170)
Purchases of treasury stock (580,708) (1,181,428)
Dividends paid (1,146,317)   
Repayment of notes payable (1,831,626) (4,113,555)
Net cash used in financing activities (3,900,691) (4,044,153)
Net (decrease) increase in cash and cash equivalents 1,171,079 (2,114,789)
Cash and cash equivalents at the beginning of the period 1,115,150 3,229,939
Cash and cash equivalents at the end of the period $ 2,286,226 $ 1,115,150