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Note 14 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
    Number of Shares   Weighted Average
Fair Value Per Share
Nonvested at January 1, 2014    
181,116
     $
10.61
  
Granted    
61,957
      
9.05
  
Vested    
(73,190
 )    
6.88
  
Forfeited    
(20,412
 )    
11.66
  
Nonvested at December 31, 2014    
149,471
      
11.65
  
Granted    
978,526
      
4.53
  
Vested    
(166,622
 )    
8.56
  
Forfeited    
(47,552
 )    
6.91
  
Nonvested at December 31, 2015    
913,823
      
4.83
  
Granted    
79,240
      
4.36
  
Vested    
(351,855
 )    
4.46
  
Forfeited    
--
      
--
  
Nonvested at December 31, 2016    
641,208
      
4.97
  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Shares awarded to each non-employee director    
11,848
      
12,135
      
6,203
  
Total shares awarded    
59,240
      
60,675
      
43,421
  
Average grant-date market price per share   $
4.22
     $
4.12
     $
8.06
  
Total compensation cost attributable to shares awarded   $
250,000
     $
250,000
     $
350,000
  
Compensation cost recognized related to current and prior year awards   $
249,995
     $
266,667
     $
316,750