Amount of equity securities categorized neither as held-to-maturity nor as trading.

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+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References+ Details

Investments (Narrative)(Details) (USD $)	3 Months Ended	12 Months Ended
Investments (Narrative)(Details) (USD $)	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate fair value of equity securities		$ 24,760,000	$ 17,408,000
Equity securities		2,600,000	2,600,000
Other-than-temporary impairment	400,000	0	(415,287)	(858,787)
Residential Construction Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recovery of temporary impairment			34.00%
Cement Business 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recovery of temporary impairment			93.00%
Cement Business 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Recovery of temporary impairment			60.00%
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate fair value of equity securities		24,761,746	17,407,800
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate fair value of equity securities		24,761,746	17,407,800
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate fair value of equity securities		0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate fair value of equity securities		$ 0	$ 0