Note 16 - Accumulated Other Comprehensive Income (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	[1]
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (1,100)	$ (1,136)
Accumulated Foreign Currency Adjustment Attributable to Preferred Equity Investments [Member]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total	$ 14,800
Accumulated Foreign Currency Adjustment Attributable to Preferred Equity Investments [Member] | CANADA
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total	$ (4,800)

[1] Represents the impact of change in accounting principles for its respective Accounting Standard Updates ("ASU"). See Footnote 2 of the Notes to Condensed Consolidated Financial Statements for additional disclosure.