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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:    
Net income $ 4,990,298 $ 5,619,798
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 2,339,378 2,384,411
Loss (gain) on sale of investments, net (195,500) (71,286)
Deferred income taxes (238,804) (434,896)
Bad Debt expense 32,604 435,344
Loss (Gain) on disposition of equipment 304,958 11,169
(Increase) decrease in operating assets:    
Accounts receivable (1,741,759) (1,213,253)
Other receivables (94,447) 215,379
Inventories (959,822) (984,711)
Refundable income taxes (930,119) (43,512)
Prepaid expenses and other current assets (6,185) (17,508)
Increase (decrease) in operating liabilities:    
Accounts payable 2,466,454 (129,514)
Accrued expenses 128,383 601,952
Income taxes payable (254,311) 254,311
Net cash provided by operating activities 5,841,128 6,627,684
Cash flows from investing activities:    
Purchases of investments (3,518,781) (1,452,672)
Proceeds from sale of investments 3,001,016 1,475,730
Investments in certificates of deposits 0 (150,255)
Redemption of certificates of deposit 423,997 0
Purchases of property and equipment (8,479,886) (1,428,717)
Proceeds from sale of equipment 710,681 0
Net cash (used in) provided by investing activities (7,862,973) (1,555,914)
Cash flows from financing activities:    
Checks written in excess of bank balances 0 (592,040)
Purchases of treasury stock 0 (580,708)
Dividends Paid (1,307,861) (1,146,317)
Net proceeds from debt issuance 4,975,000 250,000
Repayment of notes payable (624,912) (1,831,626)
Net cash provided (used in) financing activities 3,042,227 (3,900,691)
Net (decrease) increase in cash and cash equivalents 1,020,382 1,171,079
Cash and cash equivalents at the beginning of the period 2,286,226 1,115,150
Cash and cash equivalents at the end of the period $ 3,306,608 $ 2,286,226