Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Accounts receivable, net of allowance	$ 2,753	$ 2,901
Preferred stock, par value (in dollars per share)		$ 0.001
Preferred stock, shares authorized (in shares)		5,000,000
Preferred stock, shares issued (in shares)		0
Preferred stock, shares outstanding (in shares)		0
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
Treasury stock (in shares)	231,946	241,667
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
Treasury stock (in shares)	273,474	273,474