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Note 3 - Computation of Net Income (Loss) Per Share (Tables)
 9 Months Ended
Oct. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
October 31
,
    
October 31
,
  
   
2018
    
2017
    
2018
    
2017
  
   
(in thousands, except per share data)
    
(in thousands, except per share data)
  
Net income (loss)
   $
2,982
     $
(161
)
   $
5,492
     $
(3,893
)
Less: Dividends declared
    
(1,374
)
    
(1,345
)
    
(4,105
)
    
(4,021
)
Undistributed net income (loss)
   $
1,608
     $
(1,506
)
   $
1,387
     $
(7,914
)
                                 
Net income (loss) per share – Class A Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
1,178
     $
1,152
     $
3,518
     $
3,442
  
Allocation of undistributed net income (loss)
    
1,379
      
(1,291
)
    
1,189
      
(6,774
)
Net income (loss) attributable to Class A common stock
   $
2,557
     $
(139
)
   $
4,707
     $
(3,332
)
                                 
Weighted average shares of Class A common stock outstanding—
basic
    
16,358
      
16,011
      
16,235
      
15,913
  
Weighted average potential shares of Class A common stock
    
1,590
      
—
      
1,676
      
—
  
Weighted average shares of Class A common stock and potential common shares outstanding—
diluted
    
17,948
      
16,011
      
17,911
      
15,913
  
                                 
Basic net income (loss) per Class A common share
   $
0.16
     $
(0.01
)
   $
0.29
     $
(0.21
)
Diluted net income (loss) per Class A common share
   $
0.14
     $
(0.01
)
   $
0.26
     $
(0.21
)
                                 
Net income (loss) per share – Class B Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
196
     $
193
     $
587
     $
579
  
Allocation of undistributed net income (loss)
    
229
      
(215
)
    
198
      
(1,140
)
                                 
Net income (loss) attributable to Class B common stock
   $
425
     $
(22
)
   $
785
     $
(561
)
                                 
Weighted average shares of Class B common stock outstanding—
basic
    
3,264
      
3,214
      
3,253
      
3,212
  
Weighted average potential shares of Class B common stock
    
169
      
—
      
176
      
—
  
Weighted average shares of Class B common stock and potential common shares outstanding—
diluted
    
3,433
      
3,214
      
3,429
      
3,212
  
                                 
Basic net income (loss) per Class B common share
   $
0.13
     $
(0.01
)
   $
0.24
     $
(0.17
)
Diluted net income (loss) per Class B common share
   $
0.12
     $
(0.01
)
   $
0.23
     $
(0.17
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
October 31,
    
October 31,
  
   
2018
    
2017
    
2018
    
2017
  
   
(in thousands)
    
(in thousands)
  
Class A
    
241
      
3,366
      
285
      
3,209
  
Class B
    
—
      
378
      
—
      
384