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Note 2 - Computation of Net (Loss) Income Per Share (Tables)
 9 Months Ended
Oct. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
October
31,
    
October
31,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands, except per share data)
    
(in thousands, except per share data)
  
Net (loss) income
   $
(161
)
   $
1,533
     $
(3,893
)
   $
(291
)
Less: Dividends declared
    
(1,345
)
    
(1,328
)
    
(4,021
)
    
(3,970
)
Undistributed net
(loss) income
   $
(1,506
)
   $
205
     $
(7,914
)
   $
(4,261
)
                                 
Net (loss) income per share
– Class A Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
1,152
     $
1,136
     $
3,442
     $
3,393
  
Allocation of undistributed net
(loss) income
    
(1,291
)
    
175
      
(6,774
)
    
(3,638
)
Net (loss) income attributable to Class A common stock
   $
(139
)
   $
1,311
     $
(3,332
)
   $
(245
)
                                 
Weighted average shares of Class A common stock outstanding
—
basic
    
16,011
      
15,773
      
15,913
      
15,687
  
Weighted average potential shares of Class A common stock
    
—
      
829
      
—
      
—
  
Weighted average shares of Class A common stock and potential common shares outstanding
—
diluted
    
16,011
      
16,602
      
15,913
      
15,687
  
                                 
Basic net (loss) income per Class A common share
   $
(0.01
)
   $
0.08
     $
(0.21
)
   $
(0.02
)
Diluted net (loss) income per Class A common share
   $
(0.01
)
   $
0.08
     $
(0.21
)
   $
(0.02
)
                                 
Net (loss) income per share
– Class B Common Stock
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Dividends declared
   $
193
     $
192
     $
579
     $
577
  
Allocation of undistributed net
(loss) income
    
(215
)
    
30
      
(1,140
)
    
(623
)
Net (loss) income attributable to Class B common stock
   $
(22
)
   $
222
     $
(561
)
   $
(46
)
                                 
Weighted average shares of Class B common stock outstanding
—
basic
    
3,214
      
3,206
      
3,212
      
3,205
  
Weighted average potential shares of Class B common stock
    
—
      
95
      
—
      
—
  
Weighted average shares of Class B common stock and potential common shares outstanding
—
diluted
    
3,214
      
3,301
      
3,212
      
3,205
  
                                 
Basic net (loss) income per Class B common share
   $
(0.01
)
   $
0.07
     $
(0.17
)
   $
(0.01
)
Diluted net (loss) income per Class B common share
   $
(0.01
)
   $
0.07
     $
(0.17
)
   $
(0.01
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
October
31,
    
October
31,
  
   
2017
    
2016
    
2017
    
2016
  
   
(in thousands)
    
(in thousands)
  
Class A
    
3,366
      
1,135
      
3,209
      
2,961
  
Class B
    
378
      
180
      
384
      
373