Note 7 - Commitments and Contingencies (Details Textual) $ in Thousands	Dec. 31, 2019 USD ($) ft²
Finance Lease, Right-of-Use Asset \| $	$ 0
Lessee, Operating Lease, Discount Rate	5.25%
Recorded Unconditional Purchase Obligation, Total \| $	$ 1,500
Leased Automobiles [Member]
Lessee, Operating Lease, Term of Contract	3 years
GERMANY
Lessee, Operating Lease, Renewal Term	5 years
CANADA
Lessee, Operating Lease, Renewal Term	5 years
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility One [Member]
Area of Real Estate Property	27,098
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Two [Member]
Area of Real Estate Property	27,289
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Three [Member]
Area of Real Estate Property	15,642
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Four [Member] \| Massachusetts [Member]
Area of Real Estate Property	12,878
Principal Worldwide Executive, Distribution, and Manufacturing Operations Facility Five [Member] \| Massachusetts [Member]
Area of Real Estate Property	26,447
United Kingdom Sales and Distribution Business [Member] \| Hereford, England [Member]
Area of Real Estate Property	2,258
International Operations Headquarter Facility [Member] \| GERMANY
Area of Real Estate Property	16,470
Additional Area of Real Estate Property Added	3,630

Information related to the additional area of real estate added.

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308

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