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Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 3,144,116 $ 2,191,313
Adjustments to reconcile net income to net cash flows from operating activities, net of acquisition:    
Depreciation and amortization 1,189,563 1,159,123
Loss (Gain) on sale of investments, net (22,390) 2,056
Loss on disposition of equipment 0 0
Impairment of investments 0 0
Deferred income taxes (480,311) (156,040)
Bad debt expense 172,303 20,000
(Increase) decrease in operating assets:    
Accounts receivable (1,610,208) (2,117,792)
Other receivables 120,195 94,855
Inventories (472,240) (1,622,777)
Refundable income taxes 41,316 906,748
Prepaid expenses and other current assets (17,230) (41,551)
Increase (decrease) in operating liabilities:    
Accounts payable 383,612 (8,646)
Accrued expenses 39,687 42,599
Income taxes payable 1,639,515 378,482
Net cash provided by operating activities 4,127,928 848,370
Cash flows from investing activities:    
Purchases of investments (743,675) (582,697)
Proceeds from sale of investments 658,233 532,640
Investments in certificates of deposits 0 (50,000)
Proceeds from redemption of certificates of deposit 0 0
Purchases of property and equipment (478,428) (747,250)
Net cash used in investing activities (563,870) (847,307)
Cash flows from financing activities:    
Proceeds of note payable 0 250,000
Checks written in excess of bank balances 119,557 367,840
Purchases of treasury stock (340,444) (971,798)
Repayment of notes payable (1,311,679) (1,478,521)
Dividends paid (1,146,317) 0
Net cash used in financing activities (2,678,883) (1,832,479)
Net (decrease) increase in cash and cash equivalents 885,175 (1,831,416)
Cash and cash equivalents at the beginning of the period 1,115,150 3,229,939
Cash and cash equivalents at the end of the period $ 2,000,325 $ 1,398,523