Note 8 - Stock Incentive Plan - Share Based Compensation Arrangements by Share Based Payment Award (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stock based compensation	$ 409	$ 162
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)	9,302	3,055
Granted and vested, grant date fair value (in dollars per share)	$ 10.59	$ 21.95
Outstanding, shares (in shares)	63,499	31,650
Outstanding, grant date fair value (in dollars per share)	$ 18.87	$ 26.45
Stock based compensation	$ 89	$ 75
Intrinsic value, end of period	$ 681	$ 514