Note 11 - Income Taxes (Details) - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits [Abstract]
Balance at beginning of year	$ 7,511	$ 4,950
Additions based on tax positions taken in prior years	43	93
Additions based on tax positions taken in the current year	825	563
Reduction based on tax positions taken in prior years	(1,267)
Balance at end of year	$ 7,112	$ 5,606