Condensed Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES:
Net income (loss)	$ (60,468)	$ 1,097,522
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation, depletion and amortization	5,908,122	5,884,758
Deferred income taxes	(147,000)	(93,000)
Gain on disposal of assets	(23,415)	(14,799)
Realized gain on sale of equity investments	(3,881,872)	(567,544)
Postretirement benefits and pension expense	1,371,754	1,204,987
Change in assets and liabilities:
Receivables, net	(3,055,449)	(5,228,629)
Inventories	(707,001)	(2,431,065)
Refundable income taxes	1,441,206	353,199
Prepaid expenses	(466,558)	(404,967)
Other assets	974	45,626
Accounts payable and accrued liabilities	(1,689,462)	1,576,956
Net cash provided by (used for) operating activities	(1,309,169)	1,423,044
INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(10,582,128)	(3,009,507)
Proceeds from disposals of property, plant and equipment	72,598	27,783
Payment for purchases of equity investments	(605,974)	0
Proceeds from disposals of equity investments	5,262,458	1,444,378
Net cash used for investing activities	(5,853,046)	(1,537,346)
FINANCING ACTIVITIES:
Increase in revolving loan, net	6,498,002	4,310,296
Proceeds from bank loans	4,472,950	0
Payments on bank loans	(714,286)	(1,446,676)
Payments on other long-term debt	(94,451)	(100,704)
Cash dividends paid	(1,846,272)	(2,769,407)
Purchases of capital stock	(381,906)	0
Net cash provided by (used for) financing activities	7,934,037	(6,491)
Net increase (decrease) in cash and cash equivalents	771,822	(120,793)
Cash and Cash Equivalents, beginning of year	1,440,959	1,123,870
Cash and Cash Equivalents, end of period	2,212,781	1,003,077
Supplemental disclosures:
Interest paid, net of amount capitalized	138,696	237,697
Income tax refund	1,371,246	0
Capital equipment additions included in accounts payable	$ 143,631	$ 103,570