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Consolidated Statements Of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 1,956,404 $ 4,990,298 $ 5,619,798
Adjustments to reconcile net income to net cash flows from operating activities:      
Depreciation and amortization 3,251,614 2,339,378 2,384,411
Gain on sale of investments, net (98,953) (195,500) (71,286)
Deferred income taxes (719,778) (238,804) (434,896)
Bad Debt expense 204,700 32,604 435,344
(Gain) Loss on sale of equipment (6,592) 304,958 11,169
(Increase) decrease in operating assets:      
Accounts receivable 54,915 (1,741,759) (1,213,253)
Other receivables (31,066) (94,447) 215,379
Inventories 1,084,789 (959,822) (984,711)
Refundable income taxes (125,849) (930,119) (43,512)
Prepaid expenses and other current assets (123,599) (6,185) (17,508)
Increase (decrease) in operating liabilities:      
Accounts payable (1,136,424) 2,466,454 (129,514)
Accrued expenses $ 782,016 128,383 601,952
Income taxes payable   (254,311) 254,311
Net cash provided by operating activities $ 5,092,177 5,841,128 6,627,684
Cash flows from investing activities:      
Purchases of investments (3,280,157) (3,518,781) (1,452,672)
Proceeds from sale of investments 2,773,570 3,001,016 $ 1,475,730
Redemption of certificates of deposit 15,000 $ 423,997  
Investments in certificates of deposit (149,965)   $ (150,255)
Purchases of property and equipment (3,684,368) $ (8,479,886) $ (1,428,717)
Proceeds from sale of equipment 64,593 710,681  
Net cash used in investing activities $ (4,261,327) $ (7,862,973) $ (1,555,914)
Cash flows from financing activities:      
Checks written in excess of bank balance     (592,040)
Purchase of treasury stock     (580,708)
Dividends paid   $ (1,307,861) (1,146,317)
Net proceeds from debt issuance   4,975,000 250,000
Repayment of notes payable $ (877,214) (624,912) (1,831,626)
Net cash used in financing activities (877,214) 3,042,227 (3,900,691)
Net decrease in cash and cash equivalents (46,364) 1,020,382 1,171,079
Cash and cash equivalents at the beginning of the period 3,306,608 2,286,226 1,115,147
Cash and cash equivalents at the end of the period $ 3,260,244 $ 3,306,608 $ 2,286,226