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Note 14 - Business Segment Information (Details Textual)
3 Months Ended 9 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Number of Geographic Locations     4  
Number of Operating Segments     1  
Geographic Concentration Risk [Member] | North America Revenue [Member] | CANADA        
Concentration Risk, Percentage 2.00% 2.00% 2.00% 2.00%