v3.26.1
BALANCE SHEETS (Parenthetical) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
BALANCE SHEETS    
Allowance for doubtful accounts (in dollars) $ 15,000 $ 15,000
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 4,600,003 4,600,003
Common stock, shares outstanding 4,583,407 4,583,407
Treasury stock, shares at cost 150,000 100,000