Note 13 - Retirement Benefit Plans (Details Textual) - USD ($) Pure in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan, Cost	$ 1,028	$ 917	$ 1,000
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 972	$ 995	$ 986
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	0.00%