Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue by Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 284,125	$ 283,419	$ 273,800
Revenues, percentage	100.00%	100.00%	100.00%
Revenues, variance	$ 706	$ 9,619
Revenues, variance, percentage	0.20%	3.50%
Internet [Member]
Revenues	$ 238,054	$ 240,034	$ 230,319
Revenues, percentage	83.80%	84.70%	84.10%
Revenues, variance	$ (1,980)	$ 9,715
Revenues, variance, percentage	0.80%	4.20%
Contact Center [Member]
Revenues	$ 46,071	$ 43,385	$ 43,481
Revenues, percentage	16.20%	15.30%	15.90%
Revenues, variance	$ 2,686	$ (96)
Revenues, variance, percentage	6.20%	0.20%
Reorder Customer [Member]
Revenues	$ 248,560	$ 241,780	$ 227,513
Revenues, percentage	87.50%	85.30%	83.10%
Revenues, variance	$ 6,780	$ 14,267
Revenues, variance, percentage	2.80%	6.30%
New Order Customer [Member]
Revenues	$ 35,565	$ 41,639	$ 46,287
Revenues, percentage	12.50%	14.70%	16.90%
Revenues, variance	$ (6,074)	$ (4,648)
Revenues, variance, percentage	14.60%	10.00%