Note 8 - 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, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock based compensation	$ 685	$ 772	$ 244
Deferred Stock Units [Member]
Outstanding, shares (in shares)	28,595	18,189
Outstanding, grant date fair value (in dollars per share)	$ 26.92	$ 27.20
Granted and vested, shares (in shares)	25,602	10,406
Granted and vested, grant date fair value (in dollars per share)	$ 12.89	$ 26.43
Outstanding, shares (in shares)	54,197	28,595	18,189
Outstanding, grant date fair value (in dollars per share)	$ 20.29	$ 26.92	$ 27.20
Stock based compensation	$ 328	$ 240
Intrinsic value, end of period	$ 569	$ 643