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Consolidated Statements Of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 5,459,506 $ 4,546,296
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 1,760,513 1,794,259
Loss (gain) on sale of investments, net (121,441) (26,415)
Deferred income taxes (231,218) (458,424)
Bad Debt Expense 26,819 332,301
Loss (gain) on sale of equipment (209,175)  
(Increase) decrease in operating assets:    
Accounts receivable (2,612,905) (2,106,020)
Other receivables (80,275) 220,258
Inventories (2,443,101) (615,412)
Refundable income taxes (338,414) (43,512)
Prepaid expenses and other current assets 33,509 34,280
Increase (decrease) in operating liabilities:    
Accounts payable 1,173,263 732,663
Accrued expenses 167,536 340,367
Income taxes payable 1,038,451 1,341,652
Net cash provided by operating activities 3,623,068 6,092,293
Cash flows from investing activities:    
Purchases of investments (2,877,968) (1,092,976)
Proceeds from sale of investments 2,281,792 802,026
Redemption of certificates of deposits 334,627 (150,000)
Purchases of property and equipment (8,205,669) (775,210)
Proceeds from sale of equipment 537,500 0
Net cash used in investing activities (7,929,718) (1,216,160)
Cash flows from financing activities:    
Checks written in excess of bank balances   (592,040)
Purchases of treasury stock   (470,265)
Dividends paid (1,307,861) (1,146,317)
Net proceeds from debt issuance 4,975,000 0
Repayment of notes payable (405,985) (1,403,096)
Net cash used in financing activities 3,261,154 (3,611,718)
Net (decrease) increase in cash and cash equivalents (1,045,496) 1,264,415
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 $ 1,240,730 $ 2,379,565