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Note 8 - Employee Benefit Plans - Fair Value and Asset Allocations of Pension Benefits (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair value of plan assets		$ 27,252	$ 23,926	$ 21,114
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets		$ 14,295	$ 12,047
Defined Benefit Plan, Actual Plan Asset Allocations		52.00%	50.00%
Debt Security, Corporate, US [Member]
Fair value of plan assets	[1]	$ 4,720	$ 4,605
Defined Benefit Plan, Actual Plan Asset Allocations		17.00%	19.00%
Liability Driven Investment Funds [Member]
Fair value of plan assets		$ 5,722	$ 5,168
Defined Benefit Plan, Actual Plan Asset Allocations		21.00%	22.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets		$ 1,907	$ 1,860
Defined Benefit Plan, Actual Plan Asset Allocations		7.00%	8.00%
Other Plan Assets [Member]
Fair value of plan assets		$ 608	$ 246
Defined Benefit Plan, Actual Plan Asset Allocations		2.00%	1.00%
[1] Updated dimension from: "Debt Securities [Member]".

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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