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Note 8 - Intangible Assets - Acquired Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Amount	$ 61,228
Estimated weighted average amortization period (years) (Year)	9 years 109 days
Customer Lists and Relationships [Member]
Amount	$ 53,528
Estimated weighted average amortization period (years) (Year)	10 years
Trademarks and Trade Names [Member]
Amount	$ 460
Estimated weighted average amortization period (years) (Year)	2 years
Brokerage Backlog [Member]
Amount	$ 2,708
Estimated weighted average amortization period (years) (Year)	109 days
Other Intangible Assets [Member]
Amount	$ 4,532
Estimated weighted average amortization period (years) (Year)	7 years 219 days

X

- Definition

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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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- Details

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X

- Details

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- Details

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