Note 4 - Common Stock (Details Textual) - shares	Dec. 31, 2025	Dec. 31, 2024
Common Stock, Shares, Issued (in shares)	32,281,179	31,767,329
Common Stock, Shares, Outstanding (in shares)	31,074,438	30,708,273
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	2,883,057
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)	71,000
NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member] | Unsecured Debt [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	6,715