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Note 10 - Employee Benefit Plan (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure Text Block Supplement [Abstract]      
Defined Contribution Plan, Cost Recognized $ 355,428us-gaap_DefinedContributionPlanCostRecognized $ 326,416us-gaap_DefinedContributionPlanCostRecognized $ 301,196us-gaap_DefinedContributionPlanCostRecognized