Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 4,546,296	$ 3,221,354
Adjustments to reconcile net income to net cash flows from operating activities, net of acquisition:
Depreciation and amortization	1,794,259	1,751,813
Loss (gain) on sale of investments, net	(26,415)	35,533
Loss on disposition of equipment	0	20,135
Deferred income taxes	(458,424)	(186,677)
Bad debt expense	332,301	80,000
(Increase) decrease in operating assets:
Accounts receivable	(2,106,020)	(2,649,396)
Other receivables	220,258	89,847
Inventories	(615,412)	(1,794,552)
Refundable income taxes	(43,512)	906,748
Prepaid expenses and other current assets	34,280	71,913
Increase (decrease) in operating liabilities:
Accounts payable	732,663	346,276
Accrued expenses	340,367	348,403
Income taxes payable	1,341,652	351,107
Net cash provided by operating activities	6,092,293	2,592,504
Cash flows from investing activities:
Purchases of investments	(1,092,976)	(1,806,564)
Proceeds from sale of investments	802,026	990,397
Investments in certificates of deposits	(150,000)	(50,000)
Purchases of property and equipment	(775,210)	(1,241,388)
Net cash (used in) provided by investing activities	(1,216,160)	(2,107,555)
Cash flows from financing activities:
Proceeds of note payable	0	1,000,000
Checks written in excess of bank balances	(592,040)	(470,223)
Purchases of treasury stock	(470,265)	(1,022,429)
Dividends paid	(1,146,317)	0
Repayment of notes payable	(1,403,096)	(2,361,553)
Net cash used in financing activities	(3,611,718)	(2,854,205)
Net (decrease) increase in cash and cash equivalents	1,264,415	(2,369,256)
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	$ 2,379,565	$ 860,683