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SUBORDINATED DEBT (Additional Information) (Details) - USD ($)
Mar. 13, 2014
Sep. 30, 2017
Jul. 14, 2017
Mar. 31, 2017
Mar. 27, 2017
Mar. 11, 2014
Debt Instrument [Line Items]            
Principal amount outstanding   $ 149,828,000   $ 119,702,000    
Subordinated debt   86,288,000   $ 80,577,000    
Unused borrowing capacity reserve     $ 15,000,000      
Subordinated Debt            
Debt Instrument [Line Items]            
Covenant description, mandatory prepayment, net proceeds from disposition of assets 100.00%          
Covenant description, mandatory prepayment, net proceeds from issuance of debt or equity securities 100.00%          
Second Lien Credit Agreement | Subordinated Debt | Line of Credit            
Debt Instrument [Line Items]            
Principal amount outstanding   $ 86,288,000        
United States of America, Dollars | Subordinated Debt            
Debt Instrument [Line Items]            
Unused borrowing capacity, amount         $ 22,500,000 $ 32,500,000
Lower Lakes Towing Ltd. | United States of America, Dollars | Second Lien Canadian Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Effective interest rate including effect of interest rate swap contracts   15.82%   13.75%    
Face amount           34,200,000
Subordinated debt   $ 43,987,000   $ 41,645,000    
Grand River Navigation Company, Inc. | United States of America, Dollars | Second Lien US Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Effective interest rate including effect of interest rate swap contracts   15.82%   13.75%    
Face amount           $ 38,300,000
Subordinated debt   $ 42,301,000   $ 40,049,000    
LIBOR | Lower Lakes Towing Ltd. | Second Lien Canadian Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate 9.50%          
LIBOR | Grand River Navigation Company, Inc. | Second Lien US Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate 9.50%          
US Base Rate | Lower Lakes Towing Ltd. | Second Lien Canadian Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate 8.50%          
US Base Rate | Grand River Navigation Company, Inc. | Second Lien US Term Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate 8.50%