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Note 11 - Stockholder's Equity (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]
    At April 3,
2017
Current stock price   $
8.88
 
Exercise option price   $
10.25
 
Expected term of warrants (in years)    
5
 
Expected volatility rate    
48.29
 %
Risk-free rate    
1.88
 %
Expected dividend yield    
0.00
 %