Note 9 - Stock-based Compensation - Unvested Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021
Granted, number (in shares)	0	0
Unvested Option [Member]
Outstanding beginning of period (in shares)	3,000
Outstanding, weighted average grant date fair value (in dollars per share)	$ 7.33
Outstanding at beginning of period, aggregate intrinsic value		$ 4
Granted, number (in shares)
Granted, weighted average grant date fair value (in dollars per share)
Vested, number (in shares)	(3,000)
Vested, weighted average grant date fair value (in dollars per share)
Canceled options during the year (in shares)
Expired or forfeited, weighted average grant date fair value (in dollars per share)
Outstanding end of period (in shares)		3,000
Outstanding, weighted average grant date fair value (in dollars per share)	$ 7.33	$ 7.33