Note 1 - Summary of Significant Accounting Policies (Details) - Summary of Allowance for Doubtful Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Allowance for Doubtful Accounts [Abstract]
Beginning balance January 1	$ 1,736	$ 1,729	$ 1,711
Additional provisions to allowance	774	457	904
Write-offs and other deductions	(743)	(450)	(886)
Ending balance December 31	$ 1,767	$ 1,736	$ 1,729