Note 2 - Acquistions - Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liabilities
Bargain purchase gain	$ 1,300	$ (0)	$ (0)
Sonatide [Member]
Assets
Current assets	12,894
Net properties and equipment and other assets	2,907
Total assets	15,801
Liabilities
Current liabilities	283
Other liabilities	2,995
Total liabilities	3,278
Net assets acquired	11,223
Bargain purchase gain	$ 1,300