Note 5 - Fair Value Measurements - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
5% Notes	$ 357	$ 243
Total	357	243
Fair Value, Inputs, Level 1 [Member]
5% Notes	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
5% Notes	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
5% Notes	357	243
Total	$ 357	$ 243