Note 10 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011
Note 10 - Income Taxes (Details) - Unrecognized Tax Benefits [Line Items]
Balance at beginning of year				$ 449
Reductions to tax positions of prior years	12	11	9
Balance at end of year				449
Tax [Member]
Note 10 - Income Taxes (Details) - Unrecognized Tax Benefits [Line Items]
Balance at beginning of year	66	154
Reductions to tax positions of prior years	(66)	(88)
Balance at end of year	$ 0	$ 66