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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Year Ended December 31,
 
   
2016
   
2015
 
                 
Basic and diluted
   
18,923,622
     
18,839,206
 
Potentially dilutive
   
26,822
     
20,997