Note 13 - Quarterly Information (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Revenue	$ 73,264	$ 69,534	$ 69,778	$ 65,397	$ 69,259	$ 68,037	$ 71,291	$ 69,265	$ 277,973	$ 277,852	$ 295,101
Total costs and expenses	69,128	67,275	69,816	68,390	65,638	64,570	68,968	68,505	130,851	126,562	131,630
Gross margin	40,412	36,477	36,974	33,259	38,428	37,032	38,663	37,167	147,122	151,290	163,471
Operating (loss) income	4,136	2,259	(38)	(2,993)	3,621	3,467	2,323	760	3,364	10,171	15,985
Net (loss) income	$ (15,159)	$ 1,533	$ 968	$ (2,792)	$ 4,146	$ 2,586	$ 1,631	$ 549	(15,450)	8,912	12,946
Common Class A [Member]
Net (loss) income									$ (13,211)	$ 7,606	$ 10,729
Basic net (loss) income per share (in dollars per share)	$ (0.82)	$ 0.08	$ 0.05	$ (0.15)	$ 0.23	$ 0.14	$ 0.09	$ 0.03	$ (0.84)	$ 0.49	$ 0.84
Diluted net (loss) income per share (in dollars per share)	(0.82)	0.08	0.05	(0.15)	0.22	0.14	0.09	0.03	$ (0.84)	$ 0.47	$ 0.79
Common Class B [Member]
Net (loss) income									$ (2,239)	$ 1,306	$ 2,217
Basic net (loss) income per share (in dollars per share)	(0.68)	0.07	0.04	(0.13)	0.19	0.12	0.08	0.03	$ (0.70)	$ 0.41	$ 0.70
Diluted net (loss) income per share (in dollars per share)	$ (0.68)	$ 0.07	$ 0.04	$ (0.13)	$ 0.18	$ 0.12	$ 0.07	$ 0.02	$ (0.70)	$ 0.40	$ 0.68