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Note 3 - Supplemental Balance Sheet Information (in Thousands) (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Gross, Total	$ 5,000,000
Customer Contracts And Lists [Member]
Finite-Lived Intangible Assets, Gross, Total	2,680,000	$ 4,015,000
Amortization of Intangible Assets, Total	$ 569,000	$ 628,000
Customer Contracts And Lists [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Customer Contracts And Lists [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	25 years

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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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
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