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Note 10 - Income Taxes (Details) - Allocation of Income Tax Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allocation of Income Tax Expense [Abstract]
Current	$ 5,105us-gaap_CurrentIncomeTaxExpenseBenefit	$ 5,253us-gaap_CurrentIncomeTaxExpenseBenefit	$ 5,064us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense	73us-gaap_DeferredIncomeTaxExpenseBenefit	64us-gaap_DeferredIncomeTaxExpenseBenefit	204us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	$ 5,178us-gaap_IncomeTaxExpenseBenefit	$ 5,317us-gaap_IncomeTaxExpenseBenefit	$ 5,245us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.