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Note 11 - Stockholders' Equity (Tables)
 9 Months Ended
Oct. 31, 2019
Notes Tables  
Dividends Declared [Table Text Block]
Declaration
Date
Record Date
Payable
  
Dividend
Class A
    
Dividend
Class B
    
Amount
(in thousands)
  
9/4/2019
9/18/2019
9/25/2019
   $
0.072
     $
0.06
     $
1,426
  
6/24/2019
7/10/2019
7/17/2019
   $
0.072
     $
0.06
     $
1,387
  
4/9/2019
4/23/2019
5/3/2019
   $
0.072
     $
0.06
     $
1,374