Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2025	Dec. 31, 2024
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	4,756,734	4,756,734
Common stock, shares outstanding (in shares)	4,641,523	4,635,568
Treasury stock, shares (in shares)	115,211	121,166