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Note 1 - Summary of Significant Accounting Policies - Components of Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Gross Carrying Amount | $ 22,670 | $ 22,670
Accumulated Amortization | 11,967 | 11,380
Net Carrying Amount | 10,703 | 11,290
Customer Relationships [Member] |  |
Gross Carrying Amount | 22,491 | 22,491
Accumulated Amortization | 11,820 | 11,259
Net Carrying Amount | $ 10,671 | $ 11,232
Customer Relationships [Member] | Minimum [Member] |  |
Remaining Amortization Periods (Month) | 82 months | 88 months
Customer Relationships [Member] | Maximum [Member] |  |
Remaining Amortization Periods (Month) | 182 months | 188 months
Other Intangible Assets [Member] |  |
Gross Carrying Amount | $ 179 | $ 179
Accumulated Amortization | 147 | 121
Net Carrying Amount | $ 32 | $ 58
Other Intangible Assets [Member] | Minimum [Member] |  |
Remaining Amortization Periods (Month) | 2 months | 8 months
Other Intangible Assets [Member] | Maximum [Member] |  |
Remaining Amortization Periods (Month) | 39 months | 45 months

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