Long-Term Debt (Narrative) (Details)	3 Months Ended		0 Months Ended				3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	May 23, 2012 BMO Credit Agreement [Member] USD ($)	Feb. 21, 2012 BMO Credit Agreement [Member] USD ($)	Mar. 31, 2013 BMO Credit Agreement [Member] USD ($)	May 23, 2012 BMO Credit Agreement [Member] CAD	Mar. 31, 2013 Amortization of Deferred Financing Charges [Member] USD ($)	Mar. 31, 2012 Amortization of Deferred Financing Charges [Member] USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 27,500,000			28,000,000
Term of credit agreement			5 years
Line of credit facility amount drawn to repay Edmonton mortgage			3,700,000
Line of credit facility amount drawn to pay for additional equity investment				7,300,000
Line of credit facility amount outstanding					10,600,000
Line of credit facility amount available for borrowing					14,900,000
Amortization of deferred financing costs	$ 21,000	$ 24,000					$ 100,000	$ 100,000
Weighted average interest rate on borrowings	4.25%
Interest rate					4.00%