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Note 17 - Stock-based Compensation Plans - Total Estimated Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Stock-based compensation expense $ 4,909 $ 3,710 $ 2,807
Cost of Sales [Member]      
Stock-based compensation expense 220 160 90
Selling and Marketing Expense [Member]      
Stock-based compensation expense 706 436 246
Research and Development Expense [Member]      
Stock-based compensation expense 281 184 85
General and Administrative Expense [Member]      
Stock-based compensation expense $ 3,702 $ 2,930 $ 2,386