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Note 15 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Maximum Period Allocated for Calculating Average Compensation (Year)	10 years
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 574,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax, Total	(13,329,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax, Total	$ 631,000	$ 666,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Louisville Hourly Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.15%
Marion Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.40%
Louisville Salaried Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.05%
Defined Contribution Plan [Member]
Defined Contribution Plan, Cost	$ 350,000	392,000
Non US Employees Defined Benefit Plan [Member]
Defined Benefit Plan, Plan Assets, Administration Expense	$ 199,000	$ 185,000
Minimum [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.05%	3.65%
Maximum [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.40%	3.90%
Defined Benefit Plan, Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Defined Benefit Plan, Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55.00%
Fixed Income Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%
Fixed Income Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Non Traditional Securities [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Non Traditional Securities [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%

X

- Definition

Represents defined benefit plan maximum period allocated for calculating average compensation.

+ References

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- Definition

Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

+ References

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- Definition

Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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- Definition

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

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Amount of cost for defined contribution plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net periodic benefit cost (credit) of defined benefit plan.

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