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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 |

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