Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES:
Net income	$ 1,911,920	$ 3,357,896
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	8,821,833	8,906,107
Deferred income taxes	(219,000)	(54,000)
Gain on disposal of assets	(2,770,792)	(52,225)
Realized gain on sale of equity investments	(3,881,872)	(4,173,141)
Postretirement benefits and pension expense	1,702,702	1,459,601
Change in assets and liabilities:
Receivables, net	(444,604)	(5,461,573)
Inventories	2,542,789	(1,953,958)
Refundable income taxes	1,441,206	336,394
Prepaid expenses	(392,264)	(67,258)
Other assets	2,622	46,376
Accounts payable and accrued liabilities	(1,896,287)	2,922,848
Net cash provided by operating activities	6,818,253	5,267,067
INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(12,769,695)	(4,592,850)
Proceeds from disposals of property, plant and equipment	3,934,653	65,709
Payment for purchases of available-for-sale equity investments	(914,340)	0
Proceeds from disposals of available-for-sale equity investments	5,262,458	6,799,194
Net cash provided by (used for) investing activities	(4,486,924)	2,272,053
FINANCING ACTIVITIES:
Increase (decrease) in revolving loan, net	(110,137)	874,486
Proceeds from bank loans	4,472,950	0
Payments on bank loans	(1,071,429)	(2,178,255)
Net increase in restricted cash	0	(2,570,505)
Payments on other long-term debt	(142,567)	(146,478)
Cash dividends paid	(2,765,816)	(3,692,543)
Purchases of capital stock	(813,755)	0
Net cash used for financing activities	(430,754)	(7,713,295)
Net increase (decrease) in cash and cash equivalents	1,900,575	(174,175)
Cash and Cash Equivalents, beginning of year	1,440,959	1,123,870
Cash and Cash Equivalents, end of period	3,341,534	949,695
Supplemental disclosures:
Interest paid, net of amount capitalized	230,535	359,659
Income tax refund	1,424,378	1,017,606
Capital equipment additions included in accounts payable	$ 106,754	$ 89,126