Note 3 - Computation of Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Net loss	$ (410)	$ (3,234)
Dividends declared	(1,431)	(1,374)
Undistributed net loss	(1,841)	(4,608)
Net loss per share
Dividends declared	1,431	1,374
Undistributed net loss	(1,841)	(4,608)
Net loss	(410)	(3,234)
Common Class A [Member]
Net loss	(353)	(2,774)
Dividends declared	(1,232)	(1,178)
Undistributed net loss	(1,585)	(3,952)
Net loss per share
Dividends declared	1,232	1,178
Undistributed net loss	(1,585)	(3,952)
Net loss	$ (353)	$ (2,774)
Weighted average shares of common stock outstanding—basic (in shares)	17,112	16,367
Weighted average potential shares of common stock (in shares)
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	17,112	16,367
Basic net loss per common share (in dollars per share)	$ (0.02)	$ (0.17)
Diluted net loss per common share (in dollars per share)	$ (0.02)	$ (0.17)
Common Class B [Member]
Net loss	$ (57)	$ (460)
Dividends declared	(199)	(196)
Undistributed net loss	(256)	(656)
Net loss per share
Dividends declared	199	196
Undistributed net loss	(256)	(656)
Net loss	$ (57)	$ (460)
Weighted average shares of common stock outstanding—basic (in shares)	3,321	3,264
Weighted average potential shares of common stock (in shares)
Weighted average shares of common stock and potential common shares outstanding—diluted (in shares)	3,321	3,264
Basic net loss per common share (in dollars per share)	$ (0.02)	$ (0.14)
Diluted net loss per common share (in dollars per share)	$ (0.02)	$ (0.14)