Reclassification Out Of Accumulated Other Comprehensive Loss (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (106,770,282)	$ (104,282,005)	$ (95,596,864)
Selling, general and administrative expenses	(15,154,992)	(14,434,121)	(14,335,976)
Gain on sale of equity investments	3,891,296	4,173,141	5,051,406
Tax (expense) benefit	(2,870,000)	(3,725,000)	(1,240,000)
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax	1,109,187	1,268,283	1,788,030
Reclassification Out Of Accumulated Other Comprehensive Income [Member] \| Net Periodic Postretirement Benefit Cost [Member] \| Cost of Sales [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(1,222,417)	(1,225,104)	(936,992)
Tax (expense) benefit	489,180	490,550	374,663
Reclassifications, net of tax	(733,237)	(734,554)	(562,329)
Reclassification Out Of Accumulated Other Comprehensive Income [Member] \| Net Periodic Postretirement Benefit Cost [Member] \| Selling, General and Administrative Expenses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(821,692)	(837,754)	(716,097)
Tax (expense) benefit	328,820	335,450	286,337
Reclassifications, net of tax	(492,872)	(502,304)	(429,760)
Reclassification Out Of Accumulated Other Comprehensive Income [Member] \| Unrealized Net Gains on Available-for-sale Securities [Member] \| Gain on Sale of Equity Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of equity investments	3,891,296	4,173,141	5,051,406
Tax (expense) benefit	(1,556,000)	(1,668,000)	(2,024,000)
Reclassifications, net of tax	2,335,296	2,505,141	3,027,406
Reclassification Out Of Accumulated Other Comprehensive Income [Member] \| Unrealized Net Gains on Available-for-sale Securities [Member] \| Loss on Impairment of Equity Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on impairment of equity investments, reclassifications	0	0	(415,287)
Tax (expense) benefit	0	0	168,000
Reclassifications, net of tax	$ 0	$ 0	$ (247,287)

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References+ Details

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References+ Details