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Note 2 - Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
Weighted average common shares outstanding - basic
   
10,355,673
     
10,288,325
     
10,341,552
     
10,276,682
 
Potentially dilutive securities:
                               
Unvested shares of restricted stock and stock options
   
-
     
62,684
     
35,953
     
50,398
 
Weighted average common shares and common share equivalents outstanding - diluted
   
10,355,673
     
10,351,009
     
10,377,505
     
10,327,080
 
                                 
Average number of potentially dilutive securities excluded from calculation
   
360,970
     
96,000
     
188,339
     
79,753