Annual report pursuant to Section 13 and 15(d)

REVOLVING CREDIT FACILITY (Details)

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REVOLVING CREDIT FACILITY (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jul. 11, 2017
Bank of America      
Long-term debt      
Effective rate (as a percent) 282.00%    
Annual commitment fee (as a percent) 20.00%    
Outstanding balance $ 13,200,000    
Bank of America | LIBOR      
Long-term debt      
Margin on variable rate (as a percent) 125.00%    
Bank of America | Revolving credit agreement      
Long-term debt      
Maximum borrowing capacity     $ 25,000,000.0
Wells Fargo      
Long-term debt      
Effective rate (as a percent)   213.00%  
Annual commitment fee (as a percent)   25.00%  
Outstanding balance   $ 9,900,000  
Wells Fargo | LIBOR      
Long-term debt      
Margin on variable rate (as a percent)   125.00%