Note 4 - Common Stock (Details Textual) - shares	Dec. 31, 2024	Dec. 31, 2023
Common Stock, Shares, Issued (in shares)	31,767,329	31,361,303
Common Stock, Shares, Outstanding (in shares)	30,708,273	30,385,297
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	4,215,272
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member] | Share-Based Payment Arrangement, Option [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	176,000
NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member] | Unsecured Debt [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		6,715