Note 12 - Income Taxes - NOL and Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net operating loss carryforwards:
Net operating loss carryforwards	$ 80,307
Foreign Tax Authority [Member] | Australian Taxation Office [Member]
Net operating loss carryforwards:
Net operating loss carryforwards	51,286
Domestic Tax Authority [Member]
Net operating loss carryforwards:
Net operating loss carryforwards	21,138
State and Local Jurisdiction [Member]
Net operating loss carryforwards:
Net operating loss carryforwards	$ 111,242