Note 3 - Fair Value Accounting - Pension Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair value at beginning of year	$ 1,881	$ 1,713
Return on plan assets	24	92
Effect of rate changes	(137)	158
Fair value at end of year	1,689	1,881
Fair Value, Inputs, Level 3 [Member]
Fair value at beginning of year	1,881	1,713
Return on plan assets	24	92
Company contributions and benefits paid, net	(79)	(82)
Effect of rate changes	(137)	158
Fair value at end of year	$ 1,689	$ 1,881