Note 5 - Income Taxes (Details) - Changes in the Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Balance at beginning of year	$ (32,094)	$ (27,155)	$ (23,030)
Balance at end of year	(115,806)	(32,094)	(27,155)
Increase Due to Uncertainty of Recovery [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance deferred tax asset	(92,393)	(6,314)	(3,870)
Decrease Related to Utilization and Expiration [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance deferred tax asset	$ 8,681	$ 1,375	$ (255)