Consolidated Statements Of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 660,178	$ 2,365,639
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	562,280	571,967
Loss (gain) on sale of investments, net	(4,808)	(64,335)
Deferred income taxes	(196,401)	(192,090)
Bad Debt expense	126,049	51,819
Loss (Gain) on sale of equipment
(Increase) decrease in operating assets:
Accounts receivable	(468,826)	(3,244,063)
Other receivables	11,644	3,660
Inventories	(456,876)	(1,141,713)
Refundable income taxes	(1,565,376)
Prepaid expenses and other current assets	88,468	4,311
Increase (decrease) in operating liabilities:
Accounts payable	235,820	2,209,076
Accrued expenses	1,448,110	42,206
Income taxes payable		208,282
Net cash provided by operating activities	440,262	814,759
Cash flows from investing activities:
Purchases of investments	(814,804)	(1,271,516)
Proceeds from sale of investments	554,609	1,170,271
Redemption of certificates of deposit	15,000	200,000
Purchases of property and equipment	(807,894)	(324,608)
Proceeds from sale of equipment
Net cash (used in) provided by investing activities	(1,053,089)	(225,853)
Cash flows from financing activities:
Repayment of notes payable	(219,073)	(135,175)
Net cash provided (used in) financing activities	(219,073)	(135,175)
Net (decrease) increase in cash and cash equivalents	(831,900)	453,731
Cash and cash equivalents at the beginning of the period	3,306,608	2,286,226
Cash and cash equivalents at the end of the period	$ 2,474,708	$ 2,739,957