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Note 8 - Employee Benefit Plans - Fair Value and Asset Allocations of Pension Benefits (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Fair Value of Plan Assets		$ 23,926	$ 21,114	$ 17,819
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Equity Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 12,047	$ 11,534
Defined Benefit Plan, Actual Plan Asset Allocations		50.00%	55.00%
Debt Security, Corporate, US [Member]
Defined Benefit Plan, Fair Value of Plan Assets	[1]	$ 4,605	$ 3,919
Defined Benefit Plan, Actual Plan Asset Allocations		19.00%	19.00%
Liability Driven Investment Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 5,168	$ 3,615
Defined Benefit Plan, Actual Plan Asset Allocations		22.00%	17.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 1,860	$ 1,514
Defined Benefit Plan, Actual Plan Asset Allocations		8.00%	7.00%
Other Plan Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets		$ 246	$ 532
Defined Benefit Plan, Actual Plan Asset Allocations		1.00%	3.00%
[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
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
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