Note 11 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Product Liability Accrual, Component Amount	$ 0
Self Insurance Reserve	74	$ 115
Accrued Health Insurance Liabilities	$ 550	$ 344
Collective Bargaining Agreements, Number of Agreements	2
Neville Island Union [Member]
Collective Bargaining Agreement, Term (Year)	5 years
Workforce Subject to Collective Bargaining Arrangements [Member] \| Unionized Employees Concentration Risk [Member]
Concentration Risk, Percentage	14.00%
Minimum [Member]
Product Warranty Term (Year)	1 year
Maximum [Member]
Product Warranty Term (Year)	5 years

The amount of accrued health insurance liabilities as of the balance sheet date.

No definition available.

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- Definition

The term of the collective bargaining agreement.

+ References

No definition available.

+ Details

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- Definition

The number of collective bargaining agreements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents the term of warranty.

+ References

No definition available.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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Period Type:	duration

- Definition

Recorded amount of the accrual for a material component of a product liability contingency.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q2)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ 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
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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