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Note 12 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Common Class A [Member] | Karl Lopker [Member]    
Number of Vested Stock Appreciation Rights Owned by Deceased Individual, Exercisable by Estate 877,500  
Common Class B [Member] | Karl Lopker [Member]    
Number of Vested Stock Appreciation Rights Owned by Deceased Individual, Exercisable by Estate 127,500  
Common Class A and B [Member] | Karl Lopker [Member] | Minimum [Member]    
Vested Stock Appreciation Rights Owned by Deceased Individual, Exercisable by Estate, Exercise Price $ 10.50  
Common Class A and B [Member] | Karl Lopker [Member] | Maximum [Member]    
Vested Stock Appreciation Rights Owned by Deceased Individual, Exercisable by Estate, Exercise Price $ 31.65  
Restricted Stock Units (RSUs) [Member]    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 4,000 4,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ 200,000 $ 200,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 16,700,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 255 days  
Stock Appreciation Rights (SARs) [Member]    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 1,000 93,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation $ 57,000 $ 3,900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 3,800,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 255 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 200,000