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Note 9 - Stockholders' Equity (Tables)
 6 Months Ended
Jul. 31, 2017
Notes Tables  
Dividends Declared [Table Text Block]
Declaration
Date
Record Date
Payable
    
Dividend
Class A
      
Dividend
Class B
      
Amount
  
6/13/2017
6/27/2017
7/6/2017
   $
0.072
     $
0.06
     $
1,344,000
  
4/11/2017
4/25/2017
5/2/2017
   $
0.072
     $
0.06
     $
1,331,000