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Note 1 - Summary of Significant Accounting Policies - Components of Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Gross Carrying Amount | $ 22,670 | $ 22,645
Accumulated Amortization | 11,380 | 10,195
Net Carrying Amount | 11,290 | 12,450
Customer Relationships [Member] |  |
Gross Carrying Amount | 22,491 | 22,491
Accumulated Amortization | 11,259 | 10,127
Net Carrying Amount | $ 11,232 | $ 12,364
Customer Relationships [Member] | Minimum [Member] |  |
Remaining Amortization Periods (Month) | 88 months | 12 months
Customer Relationships [Member] | Maximum [Member] |  |
Remaining Amortization Periods (Month) | 188 months | 200 months
Other Intangible Assets [Member] |  |
Gross Carrying Amount | $ 179 | $ 154
Accumulated Amortization | 121 | 68
Net Carrying Amount | $ 58 | $ 86
Remaining Amortization Periods (Month) |  | 20 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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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