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Note 6 - Share-based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]
 3 Months Ended
Mar. 31, 2025
$ / shares
shares
Outstanding, Balance, RSU (in shares) | shares 117,925
Outstanding, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares $ 1.59
Granted, RSU (in shares) | shares 230,023 [1]
Granted, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares $ 1.74 [1]
Vested, RSU (in shares) | shares (250,964) [2]
Vested, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares $ 1.67 [2]
Outstanding, Balance, RSU (in shares) | shares 96,984
Outstanding, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares $ 1.74
[1] On January 2, 2025, the Company granted 96,984 restricted stock units, vesting upon one year anniversary, to the Board of Directors as a result of reduction in director cash compensation of 2025, and an aggregate of 133,039 restricted stock units, vested in full, to executives and key personnel in lieu of cash bonus earned for the year ended December 31, 2024.
[2] Represents 133,039 RSUs granted to executives and key personnel, and 212,709 RSUs granted to the Board of Directors.