Note 15 - Accumulated Other Comprehensive Income ("AOCI") (Details Textual) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Accumulated Foreign Currency Adjustment Attributable to Preferred Equity Investments [Member]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 14.8
Accumulated Foreign Currency Adjustment Attributable to Joint Venture Investments [Member] \| CANADA
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ (4.8)

Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration