Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Accounts receivable, net of allowance	$ 2,940	$ 2,901
Accumulated depreciation and amortization	$ 38,861	$ 39,173
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	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)	17,108,846	16,605,215
Treasury stock (in shares)		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)	216,378	273,474