Line of Credit and Long-Term Debt (Details) (USD $)	1 Months Ended			1 Months Ended
	Apr. 30, 2011 Revolving line of credit	Jun. 30, 2012 Revolving line of credit	Dec. 31, 2010 Revolving line of credit	May 31, 2011 Unsecured promissory note	Jun. 30, 2006 Unsecured promissory note item
Line of Credit and Long-Term Debt
Outstanding principal amount					$ 5,340,000
Number of equal annual installments					5
Equal annual installments					1,068,000
Discount rate (as a percent)					6.90%
Final payment of debt				1,068,000
Maximum borrowing capacity		5,000,000	25,000,000
Amount drawn down from credit line	$ 15,057,775
Variable rate (as a percent)		1.375%