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Consolidated Statements Of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 752,631 $ 966,595
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 1,552,997 1,769,077
Loss (gain) on sale of investments, net 21,937 $ (62,130)
Impairment of investments 179,500
Deferred income taxes (351,818) $ (440,285)
Bad Debt expense 250 156,049
Gain on sale of property and equipment (243,083) 76,484
(Increase) decrease in operating assets:    
Accounts receivable (166,829) 728,281
Other receivables 105,544 46,591
Inventories (475,597) 88,467
Refundable income taxes 399,494 (562,986)
Prepaid expenses and other current assets 138,171 (28,125)
Increase (decrease) in operating liabilities:    
Accounts payable 138,467 (1,972,157)
Accrued expenses 2,636,686 $ 1,336,163
Accrued income taxes 14,600
Net cash provided by operating activities 4,702,950 $ 2,102,024
Cash flows from investing activities:    
Purchases of investments (1,286,664) (1,774,734)
Proceeds from sale of investments 1,133,647 1,419,362
Redemption of certificates of deposit 99,965 $ 15,000
Investments in certificates of deposit (384,981)
Purchases of property and equipment (1,377,390) $ (1,761,401)
Proceeds from sale of property and equipment 342,780 4,000
Net cash used in investing activities (1,472,643) (2,097,773)
Cash flows from financing activities:    
Repayment of notes payable (617,472) (441,221)
Net cash used in financing activities (617,472) (441,221)
Net (decrease) increase in cash and cash equivalents 2,612,835 (436,970)
Cash and cash equivalents at the beginning of the period 3,260,244 3,306,608
Cash and cash equivalents at the end of the period 5,873,079 2,869,638
Supplemental cash flow information    
Cash paid for income taxes 1,120,000 2,109,500
Cash paid for interest $ 124,043 $ 132,415