CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 41,383	$ 40,641
Cost of sales	8,249	8,762
Gross profit	33,134	31,879
Operating expenses:
Commissions and incentives	16,985	17,081
Selling and administrative expenses	7,980	8,654
Depreciation and amortization expense	511	502
Other operating costs	8,546	7,676
Total operating expenses	34,022	33,913
Loss from operations	(888)	(2,034)
Interest income	29	29
Other income, net	288	41
Loss before income taxes	(571)	(1,964)
Income tax benefit	307	717
Net loss	$ (264)	$ (1,247)
Loss per common share:
Basic (in dollars per share)	$ (0.10)	$ (0.46)
Diluted (in dollars per share)	$ (0.10)	$ (0.46)
Weighted-average common shares outstanding:
Basic (in shares)	2,719	2,701
Diluted (in shares)	2,719	2,701