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LONG-TERM DEBT - Cash Money Revolving Credit Facility (Details) - Line of Credit - Cash Money Revolving Credit Facility - CAD ($)
1 Months Ended 6 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jul. 31, 2018
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 7,300,000.0  
Revolving Credit Facility | Subsequent Event      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 10,000,000.0
Revolving Credit Facility | Prime Rate      
Debt Instrument [Line Items]      
Basis spread (as percent)   1.95%  
Standby Letters of Credit      
Debt Instrument [Line Items]      
Reduction in borrowing capacity $ 300,000