Note 13 - Quarterly Information (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Total revenue	$ 80,753	$ 76,925	$ 75,958	$ 71,382	$ 73,264	$ 69,534	$ 69,778	$ 65,397	$ 305,018	$ 277,973	$ 277,852
Total costs and expenses	83,441	76,495	75,415	72,741	69,128	67,275	69,816	68,390	149,425	130,851	126,562
Gross margin	40,934	38,879	39,264	36,516	40,412	36,477	36,974	33,259	155,593	147,122	151,290
Operating (loss) income	(2,688)	430	543	(1,359)	4,136	2,259	(38)	(2,993)	(3,074)	3,364	10,171
Net (loss) income	$ (5,172)	$ (161)	$ (1,161)	$ (2,571)	$ (15,159)	$ 1,533	$ 968	$ (2,792)	(9,065)	(15,450)	8,912
Common Class A [Member]
Net (loss) income									$ (7,762)	$ (13,211)	$ 7,606
Basic net (loss) income per common share (in dollars per share)	$ (0.28)	$ (0.01)	$ (0.06)	$ (0.14)	$ (0.82)	$ 0.08	$ 0.05	$ (0.15)	$ (0.49)	$ (0.84)	$ 0.49
Diluted net (loss) income per common share (in dollars per share)	(0.28)	(0.01)	(0.06)	(0.14)	(0.82)	0.08	0.05	(0.15)	$ (0.49)	$ (0.84)	$ 0.47
Common Class B [Member]
Net (loss) income									$ (1,303)	$ (2,239)	$ 1,306
Basic net (loss) income per common share (in dollars per share)	(0.23)	(0.01)	(0.05)	(0.12)	(0.68)	0.07	0.04	(0.13)	$ (0.41)	$ (0.70)	$ 0.41
Diluted net (loss) income per common share (in dollars per share)	$ (0.23)	$ (0.01)	$ (0.05)	$ (0.12)	$ (0.68)	$ 0.07	$ 0.04	$ (0.13)	$ (0.41)	$ (0.70)	$ 0.40