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EQUITY METHOD INVESTMENTS - Narrative (Details) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Nov. 08, 2019
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]            
Equity method investments   $ 5,208,000 $ 5,208,000   $ 5,611,000  
Income (loss) from equity method investments     (910,000)   341,000  
Impairment of investment     $ 2,305,000   $ 2,000,000  
Insignia            
Schedule of Equity Method Investments [Line Items]            
Number of shares held (in shares)   3.5 3.5   3.5  
Ownership percentage   29.00% 29.00%   30.00%  
Equity method investments   $ 1,300,000 $ 1,300,000   $ 5,200,000  
Income (loss) from equity method investments     1,500,000 $ (887,000) 400,000 $ 391,000
Difference between carrying amount and underlying equity   96,000 96,000   $ 92,000  
Impairment of investment   2,300,000        
Cadillac Castings, Inc            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage 19.90%          
Income (loss) from equity method investments     600,000      
Difference between carrying amount and underlying equity $ 300,000 $ 6,042 $ 6,042      
Payments to acquire additional interest in subsidiaries $ 2,800,000