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INVENTORIES (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Other Inventory, in Transit, Gross $ 17,300,000 $ 16,400,000
Percentage of LIFO Inventory 86.00% 89.00%
Percentage of FIFO Inventory 14.00% 11.00%
Decrease In Cost Of Goods Sold $ 301,000