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Note 1 - Summary of Significant Accounting Policies - Schedule of Earnings Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income (loss) $ 454,625 $ 224,395 $ 730,947 $ (366,960) $ (432,479) $ (440,980) $ 1,409,967 $ (1,240,419)
Weighted average shares outstanding - basic (in shares) 12,637,950     12,702,683     12,641,128 12,702,683
Effect of unvested restricted stock (in shares) 12,242     0     1,532 0
Weighted average shares outstanding - diluted (in shares) 12,650,192     12,702,683     12,642,660 12,702,683
Basic (in dollars per share) $ 0.04     $ (0.03)     $ 0.11 $ (0.1)
Diluted (in dollars per share) $ 0.04     $ (0.03)     $ 0.11 $ (0.1)