Note 5 - Income Taxes (Details) - Changes in the Valuation Allowance (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Balance at beginning of year				$ (22,895)
Balance at end of year	(32,094)	(27,155)	(23,030)	(22,895)
Increase Due to Uncertainty of Recovery [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance deferred tax asset	(6,314)	(3,870)	(3,837)
Decrease Related to Utilization and Expiration [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance deferred tax asset	$ 1,375	$ (255)	$ 3,702