Note 17 - Other Employee Benefit Plans - Long-Term Disability (Details) - Long Term Disability Member [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net periodic benefit costs	$ 1,700	$ 1,483	$ 2,088
Discount rate assumption used to determine net periodic benefit costs	2.86%	3.97%	3.22%