Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, current	$ 2,113	$ 2,113
Allowance for doubtful accounts, non-current	$ 0	$ 0
Preferred stock, par value (in usd per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	847,000	830,000
Preferred stock, shares outstanding (in shares)	847,000	830,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	14,049,000	14,049,000
Treasury stock, shares (in shares)	1,929,000	1,929,000