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Note 13 - Income Taxes (Details) - Components of Income Taxes Related to Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax expense (benefit) related to components of other comprehensive income:
Change in fair value of cash flow swaps	$ 308us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	$ 338us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	$ 133us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Change in fair value of available-for-sale securities	166us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax		(9)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Total	474us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	338us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	124us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Paid in capital – stock based compensation	$ (5,207)us-gaap_DeferredTaxExpenseFromStockOptionsExercised	$ (2,566)us-gaap_DeferredTaxExpenseFromStockOptionsExercised	$ (1,668)us-gaap_DeferredTaxExpenseFromStockOptionsExercised

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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