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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

X

- 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

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- Definition

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+ 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

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+ References

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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