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Note 10 - Stockholders' Equity (Tables)
 6 Months Ended
Jul. 31, 2018
Notes Tables  
Dividends Declared [Table Text Block]
Declaration
Date
Record Date
Payable
  
Dividend
Class A
    
Dividend
Class B
    
(in thousands)
  
6/11/2018
6/25/2018
7/6/2018
   $
0.072
     $
0.06
     $
1,372
  
4/10/2018
4/24/2018
5/1/2018
   $
0.072
     $
0.06
     $
1,359