Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2010 USD ($)
Loss Contingency Accrual, Product Liability, Net, Total	$ 2	$ 10
Accrual for Environmental Loss Contingencies, Ending Balance	12	13
Damages from Product Defects [Member]
Loss Contingency, Receivable, Ending Balance	$ 13	$ 13
Property Lease Guarantee [Member] \| Structural Products [Member]
Guarantee of Lease Obligations, Number of Leases Assigned			3
Guarantee Obligations, Other Contracts			$ 6

Amount of other contracts under guarantee obligations.

No definition available.

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- Definition

The number of leases assigned under guarantee of lease obligations.

+ References

No definition available.

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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Present value of the estimated aggregate accrual for damages arising from third-party use of the entity's product(s) or process(es) as of the balance sheet date (if the accrual qualifies for discounting).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section S99
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-Subparagraph (SAB Topic 5.Y.Q1)
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Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
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