Annual report pursuant to Section 13 and 15(d)

REVOLVING CREDIT FACILITY (Details)

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REVOLVING CREDIT FACILITY (Details) - Bank of America - USD ($)
12 Months Ended
Dec. 31, 2018
Jul. 11, 2017
Long-term debt    
Effective rate (as a percent) 3.73%  
Annual commitment fee (as a percent) 0.20%  
Outstanding balance $ 0  
LIBOR    
Long-term debt    
Margin on variable rate (as a percent) 1.25%  
Revolving credit agreement    
Long-term debt    
Maximum borrowing capacity   $ 25,000,000.0