Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Allowance for doubtful accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	$ 200	$ 200
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	3	55
Valuation Allowances and Reserves, Deductions from Reserves	3	55
Valuation Allowances and Reserves, Ending Balance	200	200
Product, general, workers’ compensation and automobile liability reserves
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	1,347	1,650
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	1,357	1,101
Valuation Allowances and Reserves, Deductions from Reserves	1,439	1,404
Valuation Allowances and Reserves, Ending Balance	1,265	1,347
Deferred tax valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	925	515
Valuation Allowances and Reserves, Charged to (Reduced from) Expenses	831	410
Valuation Allowances and Reserves, Deductions from Reserves	0	0
Valuation Allowances and Reserves, Ending Balance	$ 1,756	$ 925