Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Accounts receivable, allowance	$ 3,340	$ 2,940
Accumulated depreciation and amortization	$ 42,596	$ 38,861
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)	17,375,453	17,108,846
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, shares (in shares)	207,062	216,378