Note 2 - Revenue Recognition - Disaggregation of Revenue by Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 69,936	$ 71,396	$ 149,924	$ 158,786
Revenues, percentage	100.00%	100.00%	100.00%	100.00%
Revenues, variance	$ (1,460)		$ (8,862)
Revenues, variance, percentage	2.00%		5.60%
Internet [Member]
Revenues	$ 58,453	$ 60,306	$ 125,476	$ 134,625
Revenues, percentage	83.60%	84.50%	83.70%	84.80%
Revenues, variance	$ (1,853)		$ (9,149)
Revenues, variance, percentage	3.10%		6.80%
Contact Center [Member]
Revenues	$ 11,483	$ 11,090	$ 24,448	$ 24,161
Revenues, percentage	16.40%	15.50%	16.30%	15.20%
Revenues, variance	$ 393		$ 287
Revenues, variance, percentage	3.50%		1.20%
Reorder Customer [Member]
Revenues	$ 61,851	$ 60,979	$ 129,593	$ 132,493
Revenues, percentage	88.40%	85.40%	86.40%	83.40%
Revenues, variance	$ 872		$ (2,900)
Revenues, variance, percentage	1.40%		2.20%
New Order Customer [Member]
Revenues	$ 8,085	$ 10,417	$ 20,331	$ 26,293
Revenues, percentage	11.60%	14.60%	13.60%	16.60%
Revenues, variance	$ (2,332)		$ (5,962)
Revenues, variance, percentage	22.40%		22.70%