Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES:
Net income (loss)	$ 3,357,896	$ (321,857)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation, depletion and amortization	8,906,107	8,553,737
Deferred income taxes	(54,000)	758,300
Gain on disposal of assets	(52,225)	(250,501)
Realized gain on sale of equity investments	(4,173,141)	(5,197,438)
Realized loss on impairment of equity investments	0	415,287
Postretirement benefits and pension expense	1,459,601	1,698,305
Change in assets and liabilities:
Receivables, net	(5,461,573)	(5,794,228)
Inventories	(1,953,958)	2,979,281
Refundable income taxes	336,394	(1,135,677)
Prepaid expenses	(67,258)	(925,177)
Other assets	46,376	2,250
Accounts payable and accrued liabilities	2,922,848	454,034
Net cash provided by operating activities	5,267,067	1,236,316
INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(4,592,850)	(5,601,076)
Proceeds from disposals of property, plant and equipment	65,709	287,924
Payment for acquisition of business, net of cash acquired	0	(534,392)
Payment for purchases of equity investments	0	(2,389,924)
Proceeds from disposals of equity investments	6,799,194	7,878,129
Increase in short-term investments, net	0	(10,166)
Net cash provided by (used for) investing activities	2,272,053	(369,505)
FINANCING ACTIVITIES:
Increase in line of credit, net	874,486	6,388,069
Payments on bank loans	(2,178,255)	(2,238,756)
Net increase in restricted cash	(2,570,505)	0
Payments on other long-term debt	(146,478)	(581,401)
Cash dividends paid	(3,692,543)	(3,720,289)
Purchases of capital stock	0	(2,483,069)
Net cash provided used for financing activities	(7,713,295)	(2,635,446)
Net decrease in cash and cash equivalents	(174,175)	(1,768,635)
Cash and Cash Equivalents, beginning of year	1,123,870	2,695,267
Cash and Cash Equivalents, end of period	949,695	926,632
Supplemental disclosures:
Interest paid, net of amount capitalized	359,659	380,048
Income taxes paid, net of refunds	1,017,606	385,527
Capital equipment additions included in accounts payable	89,126	75,823
Non-cash investing activities:
Issuance of 105,750 shares of capital stock related to acquisition of business	0	2,749,500
Note payable related to acquisition of business	$ 0	$ 927,443