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Note 14 - Goodwill (Details Textual)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Goodwill percentage of total assets 36.00% 36.00%
Bottom of range [member]    
Statement Line Items [Line Items]    
Growth rate 1.50%  
Top of range [member]    
Statement Line Items [Line Items]    
Growth rate 3.60%