Annual report pursuant to Section 13 and 15(d)

REVOLVING LINE OF CREDIT (Details Textual)

v3.8.0.1
REVOLVING LINE OF CREDIT (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
May 01, 2016
Line of Credit Facility [Line Items]    
Line of Credit Facility, Interest Rate Description The annual interest rate on each Base Rate Loan is (a) the greatest of (i) the Administrative Agents prime lending rate, (ii) the federal funds rate plus 0.5% per annum or the (iii) adjusted LIBOR determined on a daily basis for an interest period of one-month, plus 1.00% per annum, plus (b) a margin between 2.75% and 3.75% (depending on the then-current level of borrowing base usage).  
Leverage Ratio, Total 4.0 to 1.0  
Minimum Leverage Ratio Current 1.0 to 1.0  
Debt Instrument, Redemption, Description The Borrowing Base will be redetermined semi-annually on each May 1 and November 1, beginning November 1, 2015.  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 60
Debt Instrument, Basis Spread on Variable Rate 1.75%  
Maximum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 100
Debt Instrument, Basis Spread on Variable Rate 2.75%  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 500  
Line of Credit Facility, Expiration Date Jun. 26, 2020