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Note 16 - Stock split Subsequent Event (Details Textual)
Aug. 13, 2020
$ / shares
shares
Jul. 07, 2017
Aug. 12, 2020
shares
Jun. 30, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01 $ 0.01
Common Stock, Shares, Outstanding, Ending Balance (in shares) | shares       55,107,805 54,703,466
Stock Split from [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio   5      
Stock Split from [Member] | Forecast [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 3        
Stock Split To [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio   3      
Stock Split To [Member] | Forecast [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 2        
Stock Split [Member] | Forecast [Member]          
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01        
Stockholders' Equity Note, Stock Split, Dividend Settlement, Percent 50.00%        
Common Stock, Shares, Outstanding, Ending Balance (in shares) | shares 82,700,000   55,100,000