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Note 7 - Debt - Summary of Debt (Details) (Parentheticals) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Asset Based Revolving Credit Facility Due December 8, 2022 [Member] |  |
Maturity date | Jun. 16, 2026 | Jun. 16, 2026

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