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Long-Term Debt (Mortgage Loan) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Jun. 30, 2010
Canadian Prime [Member]
Mortgage [Member]
Dec. 31, 2010
Mortgage [Member]
Jun. 30, 2011
Mortgage [Member]
USD ($)
Jun. 30, 2010
Mortgage [Member]
USD ($)
Jun. 30, 2009
Mortgage [Member]
USD ($)
Jun. 30, 2011
Mortgage [Member]
CAD
Dec. 31, 2005
Mortgage [Member]
CAD
Mortgage loan principal amount                   15,000,000
Secured Debt   12,552,000 12,493,000              
Original mortgage maturity term (in years)           5        
Additional maturity term after extension (in months) 12                  
Debt maturity date Jan. 01, 2011
Debt maturity date after extension           1-1-2012        
Interest addition to floating rate       0.50%            
Mortgage loan fixed interest rate           5.25%        
Mortgage loan principal payment                 11,900,000  
Mortgage   12,552,000 12,493,000              
Collateral Building Net           15,400,000 15,900,000      
Interest expense           $ 600,000 $ 600,000 $ 600,000