Note 9 - Stock Incentive Plan - Share Based Compensation Arrangements by Share Based Payment Award (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock based compensation	$ 1,198	$ 685	$ 772
Deferred Stock Units [Member]
Outstanding, shares (in shares)	54,197	28,595
Outstanding, grant date fair value (in dollars per share)	$ 20.29	$ 26.92
Granted and vested, shares (in shares)	42,507	25,602
Granted and vested, grant date fair value (in dollars per share)	$ 9.81	$ 12.89
Outstanding, shares (in shares)	96,704	54,197	28,595
Outstanding, grant date fair value (in dollars per share)	$ 15.69	$ 20.29	$ 26.92
Stock based compensation	$ 378	$ 328
Intrinsic value, end of period	$ 815	$ 569