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Note 4 - (Loss) Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2020
    
2019
  
                 
Numerator:
                
Net (loss) earnings
   $
(3,804
 )   $
1,131
  
Less dividends declared:
                
Class A
    
130
      
130
  
Class B
    
709
      
708
  
Undistributed (loss) earnings
   $
(4,643
 )   $
293
  
                 
Undistributed earnings (loss) allocation - basic and diluted:
                
Class A undistributed (loss) earnings
   $
(780
 )   $
50
  
Class B undistributed (loss) earnings
    
(3,863
 )    
243
  
Total undistributed (loss) earnings
   $
(4,643
 )   $
293
  
                 
Net earnings (loss) allocation - basic and diluted:
                
Class A net (loss) earnings
   $
(649
 )   $
180
  
Class B net (loss) earnings
    
(3,155
 )    
951
  
Net (loss) earnings
   $
(3,804
 )   $
1,131
  
                 
Denominator:
                
Weighted-average shares outstanding:
                
Class A - basic and diluted
    
2,145
      
2,175
  
Class B - basic and diluted
    
10,123
      
10,089
  
                 
Net (loss) earnings per share:
                
Class A - basic and diluted
   $
(0.30
 )   $
0.08
  
Class B - basic and diluted
   $
(0.31
 )   $
0.09