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Note 13 - Stock-based Compensation and Similar Arrangements - Plan Activity (Details) - shares
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 355,598 505,452
Long Term Incentive Plan 2006 [Member]    
Number of shares of common stock authorized for issuance (in shares) 5,400,000  
Number of shares of common stock remaining available for future grants (in shares) 2,324,927  
Long Term Incentive Plan 2006 [Member] | Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 355,598  
Long Term Incentive Plan 2006 [Member] | Stock Grants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 131,540