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Consolidated Statements Of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income $ 653,718 $ 297,178
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 769,546 962,280
Loss (gain) on sale of investments, net 5,093 $ (4,808)
Impairment of investments 179,500
Deferred income taxes (196,103) $ (196,401)
Bad Debt expense 250 $ 126,049
Gain on sale of equipment (36,000)
(Increase) decrease in operating assets:    
Accounts receivable (32,942) $ (468,826)
Other receivables 15,913 11,644
Inventories (513,126) (456,876)
Refundable income taxes 1,050,032 (1,602,376)
Prepaid expenses and other current assets 164,913 88,468
Increase (decrease) in operating liabilities:    
Accounts payable (1,463,617) 235,820
Accrued expenses 1,394,698 $ 1,448,110
Accrued income taxes 144,585
Net cash provided by operating activities 2,136,460 $ 440,262
Cash flows from investing activities:    
Purchases of investments (1,005,138) (814,804)
Proceeds from sale of investments 693,223 554,609
Redemption of certificates of deposit 99,965 $ 15,000
Investments in certificates of deposit (84,981)
Purchases of property and equipment (1,039,605) $ (807,894)
Proceeds from sale of equipment 36,000
Net cash used in investing activities (1,300,536) $ (1,053,089)
Cash flows from financing activities:    
Repayment of notes payable (271,245) (219,073)
Net cash used in financing activities (271,245) (219,073)
Net (decrease) increase in cash and cash equivalents 564,679 (831,900)
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 3,824,923 2,474,708
Supplemental cash flow information    
Cash paid for income taxes 40,000 2,109,500
Cash paid for interest $ 65,110 $ 66,210