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Note 3 - Computation of Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jul. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
July 31,
    
July 31,
  
   
201
8
    
201
7
    
201
8
    
201
7
  
   
(in thousands, except per share data)
    
(in thousands, except per share data)
  
Net income (loss)
   $
1,113
     $
(1,161
)
   $
2,510
     $
(3,732
)
Less: Dividends declared
    
(1,372
)
    
(1,344
)
    
(2,731
)
    
(2,675
)
Undistributed net loss
   $
(259
)
   $
(2,505
)
   $
(221
)
   $
(6,407
)
                                 
Net
income
(loss) per share – Class A Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
1,176
     $
1,151
     $
2,340
     $
2,290
  
Allocation of undistributed net loss
    
(222
)
    
(2,145
)
    
(190
)
    
(5,483
)
Net income (loss) attributable to Class A common stock
   $
954
     $
(994
)
   $
2,150
     $
(3,193
)
                                 
Weighted average shares of Class A common stock outstanding—
basic
    
16,266
      
15,914
      
16,173
      
15,863
  
Weighted average potential shares of Class A common stock
    
1,661
      
—
      
1,713
      
—
  
Weighted average shares of Class A common stock and potential common shares outstanding—
diluted
    
17,927
      
15,914
      
17,886
      
15,863
  
                                 
Basic net income (loss) per Class A common share
   $
0.06
     $
(0.06
)
   $
0.13
     $
(0.20
)
Diluted net income (loss) per Class A common share
   $
0.05
     $
(0.06
)
   $
0.12
     $
(0.20
)
                                 
Net
income
(loss) per share – Class B Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
196
     $
193
     $
391
     $
385
  
Allocation of undistributed net loss
    
(37
)
    
(360
)
    
(31
)
    
(924
)
                                 
Net income (loss) attributable to Class B common stock
   $
159
     $
(167
)
   $
360
     $
(539
)
                                 
Weighted average shares of Class B common stock outstanding—
basic
    
3,263
      
3,212
      
3,248
      
3,211
  
Weighted average potential shares of Class B common stock
    
171
      
—
      
177
      
—
  
Weighted average shares of Class B common stock and potential common shares outstanding—
diluted
    
3,434
      
3,212
      
3,425
      
3,211
  
                                 
Basic net income (loss) per Class B common share
   $
0.05
     $
(0.05
)
   $
0.11
     $
(0.17
)
Diluted net income (loss) per Class B common share
   $
0.05
     $
(0.05
)
   $
0.11
     $
(0.17
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
July 31,
    
July 31,
  
   
201
8
    
201
7
    
201
8
    
201
7
  
   
(in thousands)
    
(in thousands)
  
Class A
    
351
      
3,219
      
179
      
3,129
  
Class B
    
—
      
384
      
—
      
387