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I. STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]    
Series B convertible preferred stock, par value $ 10 $ 10
Series B convertible preferred stock, liquidation value $ 100 $ 100
Series B convertible preferred stock, shares authorized 100 100
Series B convertible preferred stock, shares issued 1 1
Series B convertible preferred stock, shares outstanding 1 1