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Note 1 - Summary of Significant Accounting Policies - Components of Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Gross Carrying Amount | $ 22,517 | $ 22,670
Accumulated Amortization | 12,098 | 11,380
Net Carrying Amount | 10,419 | 11,290
Customer Relationships [Member] |  |
Gross Carrying Amount | 22,491 | 22,491
Accumulated Amortization | 12,095 | 11,259
Net Carrying Amount | $ 10,396 | $ 11,232
Customer Relationships [Member] | Minimum [Member] |  |
Remaining Amortization Periods (Month) | 79 months | 88 months
Customer Relationships [Member] | Maximum [Member] |  |
Remaining Amortization Periods (Month) | 179 months | 188 months
Other Intangible Assets [Member] |  |
Gross Carrying Amount | $ 26 | $ 179
Accumulated Amortization | 3 | 121
Net Carrying Amount | $ 23 | $ 58
Remaining Amortization Periods (Month) | 216 months |
Other Intangible Assets [Member] | Minimum [Member] |  |
Remaining Amortization Periods (Month) |  | 8 months
Other Intangible Assets [Member] | Maximum [Member] |  |
Remaining Amortization Periods (Month) |  | 45 months

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