Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS (Details Narrative)

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INVESTMENTS (Details Narrative) - USD ($)
1 Months Ended 6 Months Ended
Feb. 21, 2020
Oct. 31, 2018
Jul. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Investments [Line Items]              
Shares held as marketable securities       6,222,837      
Impairment loss on equity securities         $ 524,000    
Net unrealized loss on marketable securities available-for-sale       $ 800,000 $ 16,500,000    
Debt instrument, maturity date Apr. 21, 2021            
EJ Holding, Inc. [Member]              
Schedule Of Investments [Line Items]              
Investment amount             $ 32,000
Percentage of voting interest             40.00%
Unsecured debt   $ 13,600,000   13,900,000   $ 13,800,000  
Debt instrument, maturity date   Sep. 30, 2028          
Debt instrument annual interest   1.00%          
Unsecured debt, additional borrowings       561,000      
Loans receivable       $ 14,500,000      
Telcon, Inc. ("Telcon") [Member]              
Schedule Of Investments [Line Items]              
Shares held as marketable securities       6,222,837   6,643,559  
Investment     $ 31,800,000        
Investment, closing price       $ 4.34   $ 4.20  
Telcon, Inc. ("Telcon") [Member] | API Supply Agreement [Member] | 10-year Convertible Bond [Member]              
Schedule Of Investments [Line Items]              
Convertible notes payable, carrying amount           $ 31,800,000  
Shares issued       420,772      
Proceeds from sale of convertible notes       $ 2,100,000      
Japan Industrial Partners [Member] | EJ Holding, Inc. [Member]              
Schedule Of Investments [Line Items]              
Equity interest             60.00%