Line of Credit (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Mar. 20, 2012	Dec. 31, 2011
Line of Credit (Textual) [Abstract]
Line of Credit bears interest at BMO Bank's prime rate	3.25%		3.25%
Line of Credit (Additional Textual) [Abstract]
Agreement provides for borrowings under a revolving line of credit	$ 50,000,000	$ 35,000,000
Revolving line of credit, scheduled maturity date	Apr. 29, 2014
Revolving line of credit, extended maturity date	Mar. 20, 2017
Unused and available line of credit balance	25,400,000		15,300,000
Outstanding borrowings under its revolving line of credit	2,600,000		4,700,000
Percentage of unused line fee	0.25%
Liquidity Threshold		7,500,000
Percent of total credit facility		12.50%
Consecutive days of liquidity threshold	60 days
Remaining outstanding balance	$ 22,000,000		$ 15,000,000
Percentage of applicable margin	1.99%		2.29%
Maximum [Member]
Line of Credit (Textual) [Abstract]
Line of Credit, interest at LIBOR	2.25%	2.50%
Applicable margin, during the period	0.50%
Minimum [Member]
Line of Credit (Textual) [Abstract]
Line of Credit, interest at LIBOR	1.75%	2.00%
Applicable margin, during the period	0.00%
Bank's prime rate [Member] | Maximum [Member]
Line of Credit (Textual) [Abstract]
Line of Credit bears interest at BMO Bank's prime rate		0.50%
Bank's prime rate [Member] | Minimum [Member]
Line of Credit (Textual) [Abstract]
Line of Credit bears interest at BMO Bank's prime rate		0.00%