Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Allowance for doubtful accounts	$ 504	$ 484
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	1,683,000	1,683,000
Preferred stock, shares outstanding (in shares)	1,683,000	1,683,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	15,721,000	15,705,000
Treasury stock, shares (in shares)	1,933,000	1,931,000