Note 12 - Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations [Table Text Block]

	2014		2013
Asset retirement obligations	$	21,610	$	6,095
Less: Asset retirement obligations due within one year*		--		--
Long-term asset retirement obligations	$	21,610	$	6,095

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	2014			2013			2012
Balance as of January 1	$	6,095		$	5,518		$	4,615
Accretion of discount		336			350			305
New obligations		797			566			--
Change in estimates of existing obligations		14,838			34			491
Foreign currency translation		(456	)		(373	)		107
Balance as of December 31	$	21,610		$	6,095		$	5,518