Note 8 - Retirement Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%
Defined Benefit Plan, Actual Return on Plan Assets Less Expected Return	$ 0.3
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.50%	7.50%
Other Comprehensive Income (Loss), Defined Benefit Plan, Actuarial Gain (Loss) Arising During Period, after Tax		$ (0.5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Actuarial Gain Arising During Period, after Tax	$ 0.3	0.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Loss Arising During Period, after Tax	$ 0.3	$ 0.8
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease)	(0.30%)	(1.10%)
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	1.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Payroll Deferral Contributions	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Payroll Deferral Contributions	5.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.3	$ 0.3
Maximum [Member]
Other Comprehensive Income (Loss), Defined Benefit Plan, Actuarial Gain (Loss) Arising During Period, after Tax	$ 0.1
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	16.00%
Minimum [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Defined Benefit Plan, Equity Securities [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	72.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		60.00%
Defined Benefit Plan, Debt Security [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	26.00%
Other Debt Obligations [Member]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	2.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		30.00%
Alternative Investments [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		10.00%