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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
FAIR VALUE MEASUREMENTS      
Corporate & municipal bonds and money market funds   $ 21,870 $ 12,615
Property plant and equipment at fair value   560  
Impairment charge recorded to reduce the carrying value of assets to fair value     183
Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value     506
Impairment charge recorded to reduce the carrying value of assets to fair value   0  
Gearing equipment      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   353 506
Level 3 | Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value     506
Recurring | Corporate & municipal bonds and money market funds      
FAIR VALUE MEASUREMENTS      
Corporate & municipal bonds and money market funds   5,049 8,001
Recurring | Level 2 | Corporate & municipal bonds and money market funds      
FAIR VALUE MEASUREMENTS      
Corporate & municipal bonds and money market funds   5,049 8,001
Nonrecurring      
FAIR VALUE MEASUREMENTS      
Total assets at fair value   6,417 12,964
Nonrecurring | Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   353  
Nonrecurring | Services      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   455 3,343
Nonrecurring | Clintonville, WI facility      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value     554
Impairment charge recorded to reduce the carrying value of assets to fair value $ 288    
Additional asset impairment charges     186
Nonrecurring | Gearing Cicero Ave. facility | Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   560 560
Nonrecurring | Level 2      
FAIR VALUE MEASUREMENTS      
Total assets at fair value   5,049 8,001
Nonrecurring | Level 3      
FAIR VALUE MEASUREMENTS      
Total assets at fair value   1,368 4,963
Nonrecurring | Level 3 | Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   353  
Nonrecurring | Level 3 | Services      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   455 3,343
Nonrecurring | Level 3 | Clintonville, WI facility      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value     554
Nonrecurring | Level 3 | Gearing Cicero Ave. facility | Gearing      
FAIR VALUE MEASUREMENTS      
Property plant and equipment at fair value   $ 560 $ 560