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Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (3,279) $ 926
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (8) 19
Total comprehensive income (loss) $ (3,287) $ 945