Note 13 - Income Taxes - NOL Carryforwards (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2012 |
|
| Balance at December 31, 2021 | $ 50,771 | $ 76,396 | |
| Net operating losses used and expired | (22,131) | (25,625) | |
| Balance at December 31, 2022 | 28,640 | 50,771 | |
| Balance at December 31, 2023 | 28,640 | 50,771 | $ 16,300 |
| Pre-Ownership Change [Member] | |||
| Balance at December 31, 2021 | 5,147 | 9,614 | |
| Net operating losses used and expired | (638) | (4,467) | |
| Balance at December 31, 2022 | 4,509 | 5,147 | |
| Balance at December 31, 2023 | 4,509 | 5,147 | |
| Post-ownership change [Member] | |||
| Balance at December 31, 2021 | 45,624 | 66,782 | |
| Net operating losses used and expired | (21,493) | (21,158) | |
| Balance at December 31, 2022 | 24,131 | 45,624 | |
| Balance at December 31, 2023 | $ 24,131 | $ 45,624 | |