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Note 14 - Subsequent Events (Details Textual) - Jul. 26, 2022 - Subsequent Event [Member] - Nestor Cables Oy [Member] € in Millions, $ in Millions | USD ($) | EUR (€)
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Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | € 7.9
Business Combination, Consideration Transferred, Liabilities Incurred |  | € 7.6
Revolving Credit Facility [Member] |  |
Proceeds from Lines of Credit, Total | $ | $ 16.7 |

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