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Note 2 - Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
 
Three Months Ended
June 30,
Six Months Ended
June 30,
 
2017
2016
2017
2016
Weighted average common shares outstanding - basic
    
10,277,155
      
10,295,836
      
10,270,860
      
10,342,919
  
Potentially dilutive securities:
                                
Unvested shares of restricted stock and stock options
    
57,739
      
14,856
      
44,255
      
14,549
  
Weighted average common shares and common share equivalents outstanding - diluted
    
10,334,894
      
10,310,692
      
10,315,115
      
10,357,468
  
                                 
Average number of potentially dilutive securities excluded from calculation
    
96,000
      
19,800
      
71,630
      
17,516