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Consolidated Statements Of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 1,754,595 $ 3,769,579
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 1,369,077 1,171,515
Gain on sale of investments, net (62,130) (121,280)
Deferred income taxes (440,285) (104,133)
Bad Debt expense 156,049 26,819
Loss on sale of equipment 76,484   
(Increase) decrease in operating assets:    
Accounts receivable 728,281 (1,211,015)
Other receivables 46,591 3,425
Inventories 88,467 (1,867,964)
Refundable income taxes (950,986) 56,705
Prepaid expenses and other current assets (28,125) (515,633)
Increase (decrease) in operating liabilities:    
Accounts payable (1,972,157) 2,909,652
Accrued expenses 1,336,163 (60,857)
Income taxes payable    969,804
Net cash provided by operating activities 2,102,024 5,026,617
Cash flows from investing activities:    
Purchases of investments (1,774,734) (2,573,721)
Proceeds from sale of investments 1,419,362 1,948,839
Redemption of certificates of deposit 15,000 334,627
Purchases of property and equipment (1,761,401) (547,819)
Proceeds from sale of equipment 4,000   
Net cash used in investing activities (2,097,773) (838,074)
Cash flows from financing activities:    
Dividends paid    (1,307,861)
Repayment of notes payable (441,221) (226,960)
Net cash used in financing activities (441,221) (1,534,821)
Net (decrease) increase in cash and cash equivalents (436,970) 2,653,722
Cash and cash equivalents at the beginning of the period 3,306,608 2,286,226
Cash and cash equivalents at the end of the period $ 2,869,638 $ 4,939,948