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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Preferred Stock Additional Paid-in Capital [Member]
Common Stock [Member]
Common Stock, Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2021 1   126,624      
Balance at Dec. 31, 2021 $ 0 $ 582 $ 22,792 $ 243,996 $ (129,234) $ 138,136
Compensation cost for stock options granted 0 0 0 1,806 0 1,806
Net loss $ 0 0 $ 0 0 (4,786) (4,786)
Balance (in shares) at Mar. 31, 2022 1   126,624      
Balance at Mar. 31, 2022 $ 0 582 $ 22,792 245,802 (134,020) 135,156
Balance (in shares) at Dec. 31, 2022 1   126,624      
Balance at Dec. 31, 2022 $ 0 582 $ 22,792 250,784 (156,194) 117,964
Compensation cost for stock options granted 0 0 0 1,573 0 1,573
Net loss $ 0 0 $ 0 0 (6,281) (6,281)
Balance (in shares) at Mar. 31, 2023 1   126,624      
Balance at Mar. 31, 2023 $ 0 $ 582 $ 22,792 $ 252,357 $ (162,475) $ 113,256