Note 2 - Sale of Subsidiaries and Subsequent Events - Summary of Condensed Balance Sheet (Details) (Parentheticals) - USD ($) $ / shares in Units, $ in Thousands	Jul. 31, 2023	Jan. 31, 2023
Allowance for doubtful accounts	$ 504	$ 504
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	15,721,000
Treasury stock, shares (in shares)	1,933,000	1,933,000
Pro Forma [Member]
Allowance for doubtful accounts	$ 504
Preferred stock, par value (in dollars per share)	$ 1.00
Preferred stock, shares authorized (in shares)	2,000,000
Preferred stock, shares issued (in shares)	1,683,000
Preferred stock, shares outstanding (in shares)	1,683,000
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	40,000,000
Common stock, shares issued (in shares)	15,721,000
Treasury stock, shares (in shares)	1,933,000