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Note 4 - Share-based Compensation - Outstanding Performance Shares (Details) - Performance Shares [Member] - shares
Sep. 30, 2017
Dec. 31, 2016
Performance shares (in shares) 289,615 241,141
Vesting Subject to Time-based Restrictions [Member]    
Performance shares (in shares) 6,325  
Vesting Upon Achievement of 2015-2017 Consolidated Revenues Target [Member]    
Performance shares (in shares) 50,000  
Vesting Upon Achievement of 2016-2018 Consolidated Revenues Target [Member]    
Performance shares (in shares) 149,393  
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member]    
Performance shares (in shares) 83,897