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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
CURRENT ASSETS:    
Allowance for doubtful accounts $ 14 $ 14
Accumulated amortization $ 548 $ 548
STOCKHOLDERS' EQUITY:    
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0024 $ 0.0024
Common stock, shares authorized (in shares) 25,000,000 25,000,000
Common stock, shares issued (in shares) 10,091,262 10,575,182
Treasury stock, shares (in shares) 1,424,376 1,424,376
Accumulated other comprehensive loss, tax $ 0 $ 395