Shareholders' Equity - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2019 quarter $ / shares shares	Jan. 31, 2018 $ / shares shares	Jan. 31, 2017 $ / shares shares
Statement Of Shareholders Equity [Line Items]
Preferred stock, shares authorized | shares	1,000,000	1,000,000
Preferred stock, shares outstanding | shares	830,000	532,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1.00	$ 1.00
Number of quarterly periods to obtain voting rights | quarter	6
Common stock, shares authorized | shares	20,000,000	20,000,000
Common stock, shares issued | shares	14,049,000	14,019,000
Shares surrendered in exchange for payment of taxes | shares	0	359	718
Average fair value of shares (in usd per share) | $ / shares		$ 4.79	$ 3.76
Series A Preferred Stock
Statement Of Shareholders Equity [Line Items]
Preferred stock, shares outstanding | shares	830,000	532,000
Preferred stock, dividend rate	9.00%
Preferred stock, par value (in usd per share) | $ / shares	$ 1.00
Preferred stock, liquidation preference per share (in usd per share) | $ / shares	25.00
Preferred stock, dividend rate (in usd per share) | $ / shares	2.25
Preferred stock, redemption price (in usd per share) | $ / shares	$ 25.00
Preferred stock, redemption period	120 days
Period of time for listing	180 days