Note 3 - Impairment Charges (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Asset Impairment Charges [Table Text Block]

	Canada		Australia		U.S.		Total
Quarter ended September 30, 2017
Long-lived assets	$	4,360	$	--	$	--	$	4,360
Quarter ended December 31, 2017
Long-lived assets		27,244		--		--		27,244
Total	$	31,604	$	--	$	--	$	31,604

	Canada		Australia		U.S.		Total
Quarter ended March 31, 2016
Long-lived assets	$	--	$	--	$	8,400	$	8,400
Quarter ended September 30, 2016
Long-lived assets		37,729		--		--		37,729
Total	$	37,729	$	--	$	8,400	$	46,129

	Canada		Australia		U.S. and Other		Total
Quarter ended March 31, 2015
Long- lived assets	$	--	$	--	$	2,738	$	2,738
Quarter ended June 30, 2015
Long- lived assets		--		9,473		--		9,473
Quarter ended September 30, 2015
Goodwill		43,194		--		--		43,194
Long- lived assets		23,041		23,980		18,040		65,061
Intangible assets		--		--		2,460		2,460
Total	$	66,235	$	33,453	$	23,238	$	122,926