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Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
ASSETS    
Other physical property, accumulated depreciation $ 489 $ 483
CURRENT ASSETS:    
Accounts receivables, reserves $ 852 $ 855
COMMON STOCKHOLDERS' EQUITY:    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized (in shares) 46,500,000 46,500,000
Common stock, issued (in shares) 13,123,619 13,112,948
Common stock, outstanding (in shares) 13,123,619 13,112,948
Preferred stock, authorized (in shares) 500,000 500,000
Preferred stock, issued (in shares) 0 0