Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Accounts receivable, net of allowance	$ 1,902	$ 1,763
Treasury stock (in shares)	718,323	892,700
Common Class A [Member]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	71,000,000	71,000,000
Common stock, shares issued (in shares)	16,605,215	16,605,215
Common Class B [Member]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	4,000,000	4,000,000
Common stock, shares issued (in shares)	3,537,380	3,537,380