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Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 3,769,579 $ 3,144,116
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 1,171,515 1,189,563
Loss (gain) on sale of investments, net (121,280) (22,390)
Deferred income taxes (104,133) (480,311)
Bad Debt Expense 26,819 172,303
(Increase) decrease in operating assets:    
Accounts receivable (1,211,015) (1,610,208)
Other receivables 3,425 120,195
Inventories (1,867,964) (472,240)
Refundable income taxes 56,705 41,316
Prepaid expenses and other current assets (515,633) (17,230)
Increase (decrease) in operating liabilities:    
Accounts payable 2,909,652 383,612
Accrued expenses (60,857) 39,687
Income taxes payable 969,804 1,639,515
Net cash provided by operating activities 5,026,617 4,127,928
Cash flows from investing activities:    
Purchases of investments (2,573,721) (743,675)
Proceeds from sale of investments 1,948,839 658,233
Redemption of certificates of deposits 334,627 0
Purchases of property and equipment (547,819) (478,428)
Net cash used in investing activities (838,074) (563,870)
Cash flows from financing activities:    
Checks written in excess of bank balances   119,557
Purchases of treasury stock   (340,444)
Dividends paid (1,307,861) (1,146,317)
Repayment of notes payable (226,960) (1,311,679)
Net cash used in financing activities (1,534,821) (2,678,883)
Net (decrease) increase in cash and cash equivalents 2,653,722 885,175
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 $ 4,939,948 $ 2,000,325