v3.8.0.1
DEBT (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Apr. 30, 2013
USD ($)
Debt                
Long-Term Debt $ 60,000,000   $ 60,000,000   $ 60,000,000   $ 135,000,000  
Interest Costs Incurred, Gross 2,076,000 $ 4,058,000 10,777,000 $ 9,463,000        
Proceeds from Lines of Credit     9,000,000 0        
Repayments of Lines of Credit     9,000,000 $ 0        
Senior Notes                
Debt                
Debt, Face Amount               $ 150,000,000
Repayments of Debt 6,000,000   75,000,000   90,000,000      
Additional Required Principal Payment By December 31, 2018 10,000,000   10,000,000   10,000,000      
Additional Payment Required For Senior Notes, Payment To Date 0   0   0      
Long-Term Debt 60,000,000   60,000,000   60,000,000   $ 135,000,000  
Adjusted EBITDA         19,400,000      
Debt Instrument Minimum Liquidity Requirement 15,000,000   15,000,000   15,000,000      
Debt instrument liquidity 24,200,000   $ 24,200,000   24,200,000      
Bank Of Montreal                
Debt                
Minimum Fixed Charge Ratio     1          
Line of Credit Facility, Maximum Borrowing Capacity 35,000,000   $ 35,000,000   35,000,000      
Line of Credit Facility, Capacity Available for Notes Repayment 10,000,000   10,000,000   10,000,000      
Line of Credit Facility, Borrowing Capacity, Threshold, Fixed Charge Coverage Ratio 6,000,000   6,000,000   6,000,000      
Proceeds from Lines of Credit     9,000,000          
Repayments of Lines of Credit     9,000,000          
Line of Credit, Outstanding 0   0   0      
Letters of Credit Outstanding, Amount 3,500,000   3,500,000   3,500,000      
Line of Credit Facility, Current Borrowing Capacity 22,500,000   22,500,000   22,500,000      
Maximum | Senior Notes                
Debt                
Debt Instrument, Covenant Compliance, EBITDA 10,000,000   10,000,000   10,000,000      
Minimum Fixed Charge Coverage Amount     $ 15,000,000          
Maximum Leverage Ratio     11.5          
Minimum Fixed Charge Ratio     1.3          
Maximum Leverage Ratio Interest Rate     7.5          
Maximum | London Interbank Offered Rate (LIBOR) | Bank Of Montreal                
Debt                
Debt Instrument, Basis Spread on Variable Rate     2.25%          
Minimum | Senior Notes                
Debt                
Debt Instrument, Covenant Compliance, EBITDA 7,500,000   $ 7,500,000   7,500,000      
Minimum Fixed Charge Coverage Amount     $ 10,000,000          
Maximum Leverage Ratio     3.5          
Minimum Fixed Charge Ratio     0.25          
Minimum Fixed Charge Ratio Interest Rate     1.3          
Minimum | London Interbank Offered Rate (LIBOR) | Bank Of Montreal                
Debt                
Debt Instrument, Basis Spread on Variable Rate     1.75%          
Series A Senior Notes | Senior Notes                
Debt                
Long-Term Debt $ 24,000,000   $ 24,000,000   $ 24,000,000      
Interest Rate 7.73%   7.73%   7.73%      
Series B Senior Notes | Senior Notes                
Debt                
Long-Term Debt $ 18,000,000   $ 18,000,000   $ 18,000,000      
Interest Rate 8.63%   8.63%   8.63%      
Series C Senior Notes | Senior Notes                
Debt                
Long-Term Debt $ 18,000,000   $ 18,000,000   $ 18,000,000      
Interest Rate 8.78%   8.78%   8.78%      
Scenario, Forecast [Member] | Series A Senior Notes | Senior Notes                
Debt                
Interest Rate           3.73%    
Scenario, Forecast [Member] | Series B Senior Notes | Senior Notes                
Debt                
Interest Rate           4.63%    
Scenario, Forecast [Member] | Series C Senior Notes | Senior Notes                
Debt                
Interest Rate           4.78%