Note 8 - Right-of-use Asset and Lease Liability - Lease Information (Details) - USD ($) $ in Thousands  | 
6 Months Ended | |
|---|---|---|
Jun. 30, 2024  | 
Jun. 30, 2023  | 
|
| Cash paid for operating lease liabilities | $ 320 | $ 312 | 
| Right-of-use assets obtained in exchange for new operating lease obligations | $ 69 | $ 0 | 
| Weighted-average remaining lease term (years) (Year) | 2 years 8 months 12 days | 3 years 7 months 6 days | 
| Weighted-average discount rate | 3.60% | 3.50% | 
| X | ||||||||||
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
  | 
| X | ||||||||||
- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
  | 
| X | ||||||||||
- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
  | 
| X | ||||||||||
- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
  |