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Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
ASSETS    
Other physical property, accumulated depreciation $ 471 $ 458
CURRENT ASSETS:    
Accounts receivables, reserves $ 792 $ 655
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) 13,090,055 13,060,817
Common stock, outstanding (in shares) 13,090,055 13,060,817
Preferred stock, authorized (in shares) 500,000 500,000
Preferred stock, issued (in shares) 0 0