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Note 15 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Maximum Period Allocated for Calculating Average Compensation	10 years
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 893,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.90%
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax, Total	$ (13,007,000)
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	(635,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax, Total	$ 666,000	$ 632,000
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	3.90%
Marion Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.85%
Louisville Salaried Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.65%
Defined Contribution Plan [Member]
Defined Contribution Plan, Cost	$ 392,000	376,000
Non US Employees Defined Benefit Plan [Member]
Defined Benefit Plan, Plan Assets, Administration Expense	$ 40,000	$ 41,000
Minimum [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	3.65%	4.30%
Maximum [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		3.95%
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

No definition available.

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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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-Topic 220
-SubTopic 10
-Section 45
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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 included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest 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, 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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