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Note 13 - 401(k) Savings Plan (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 13 - 401(k) Savings Plan (Details) [Line Items]      
Defined Benefit Plan Employee Eligible Service Period 1 month    
Defined Benefit Plan Eligible Age for Employee 21 years    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 50.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 6.00%    
Defined Contribution Plan Employee Eligible Service Period for Employer Match 6 months    
Defined Contribution Plan, Cost Recognized $ 143,000 $ 132,000 $ 130,000
Alternative [Member]      
Note 13 - 401(k) Savings Plan (Details) [Line Items]      
Defined Contribution Plan Employee Eligible Service Period for Employer Match 500 hours