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Note 7 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Shares-to-be-issued, outstanding (in shares) 3,393,017 3,098,917
Granted in current period (in shares) 315,646 438,868
Issued in current period (in shares) 0 (353,102)
Shares-to-be-issued, outstanding (in shares) 3,708,663 3,184,683