Consolidated Statements Of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 1,645,483	$ 1,980,273
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	2,345,746	2,558,962
Loss (gain) on sale of investments, net	21,098	$ (39,190)
Impairment of investments	384,500
Deferred income taxes	(472,375)	$ (783,607)
Bad Debt expense	250	76,049
Gain on sale of property and equipment	(243,083)	(8,592)
(Increase) decrease in operating assets:
Accounts receivable	(540,194)	(1,548,110)
Other receivables	53,674	76,552
Inventories	(1,117,554)	(235,849)
Refundable income taxes	1,011,370	972,522
Prepaid expenses and other current assets	197,956	73,379
Increase (decrease) in operating liabilities:
Accounts payable	(396,162)	595,333
Accrued expenses	1,038,376	$ (40,184)
Accrued income taxes	448,891
Net cash provided by operating activities	4,377,976	$ 3,677,538
Cash flows from investing activities:
Purchases of investments	(1,369,285)	(2,319,742)
Proceeds from sale of investments	1,229,855	1,736,946
Redemption of certificates of deposit	249,965	$ 15,000
Investments in certificates of deposit	(634,678)
Purchases of property and equipment	(1,618,716)	$ (3,052,303)
Proceeds from sale of property and equipment	342,780	89,076
Net cash used in investing activities	(1,800,079)	(3,531,023)
Cash flows from financing activities:
Repayment of notes payable	(827,472)	(657,694)
Net cash used in financing activities	(827,472)	(657,694)
Net (decrease) increase in cash and cash equivalents	1,750,425	(511,179)
Cash and cash equivalents at the beginning of the period	3,260,244	3,306,608
Cash and cash equivalents at the end of the period	5,010,669	2,795,429
Supplemental cash flow information
Cash paid for income taxes	1,120,000	2,131,658
Cash paid for interest	$ 177,521	$ 195,275