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Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
ASSETS    
Other physical property, accumulated depreciation $ 501 $ 463
CURRENT ASSETS:    
Accounts receivables, reserves $ 1,005 $ 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) 14,332,245 14,285,584
Common stock, outstanding (in shares) 14,332,245 14,285,584
Preferred stock, authorized (in shares) 500,000 500,000
Preferred stock, issued (in shares) 0 0