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Note 10 - Derivatives (Details Textual) € in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Apr. 30, 2022 EUR (€)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 EUR (€)	Jun. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 0.8
Designated as Hedging Instrument [Member]
Derivative, Term of Contract (Year)		1 year	1 year
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount		$ 44.3			$ 57.3
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount		2.9			2.7
Foreign Exchange Option [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount		$ 5.9			$ 8.2
Currency Swap [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount | €				€ 156.0		€ 159.6
Debt Instrument, Periodic Payment, Interest | €			€ 6.0
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Principal | €	€ 150.0

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of the required periodic payments applied to interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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X

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Details

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- Details

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