Note 10 - Stockholders' Equity - Stock-based Compensation Expense 2 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-based compensation expense	$ 1,953	$ 1,628	$ 3,849	$ 3,654
Share-Based Payment Arrangement, Option [Member] \| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Share-based compensation expense	55	46	109	93
Share-Based Payment Arrangement, Option [Member] \| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Share-based compensation expense	249	235	495	545
Restricted Stock Units (RSUs) [Member] \| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Share-based compensation expense	719	590	1,422	1,334
Restricted Stock Units (RSUs) [Member] \| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Share-based compensation expense	$ 930	$ 757	$ 1,823	$ 1,682