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Note 18 - Financial Instruments - Financial Assets and Liabilities Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest rate swap asset	$ 926	$ 751
Fair Value, Inputs, Level 3 [Member]
Contingent consideration liability	93,865	$ 50,300	$ 32,266
Fair Value, Measurements, Recurring [Member]
Interest rate swap asset	926
Contingent consideration liability	93,865
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Marketable securities	2,835
Fair Value, Measurements, Recurring [Member] | Fixed Income Securities [Member]
Marketable securities	4,101
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate swap asset
Contingent consideration liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Marketable securities	2,835
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Marketable securities	185
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swap asset	926
Contingent consideration liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Marketable securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]
Marketable securities	3,916
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swap asset
Contingent consideration liability	93,865
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Marketable securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member]
Marketable securities

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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X

- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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