Contingencies - Accrual for Environmental Remediation Table (Details) (USD $)	12 Months Ended
Dec. 31, 2012
Notes to Financial Statements
Environmental remediation accrual at December 31, 2011	$ 239,016
Payments	(115,000)
Environmental remediation accrual at December 31, 2012	$ 123,587

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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