CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 47,686	$ 48,810	$ 88,327	$ 89,518
Cost of sales	8,786	10,100	17,548	18,489
Gross profit	38,900	38,710	70,779	71,029
Operating expenses:
Commissions and incentives	18,994	20,417	36,075	36,034
Selling and administrative expenses	9,978	9,730	18,632	18,322
Depreciation and amortization expense	453	477	955	920
Other operating costs	6,656	8,198	14,332	15,329
Total operating expenses	36,081	38,822	69,994	70,605
Income (loss) from operations	2,819	(112)	785	424
Interest income	19	23	48	11
Other income (expense), net	(9)	(1,037)	32	(703)
Income (loss) before income taxes	2,829	(1,126)	865	(268)
Income tax provision	(1,034)	(206)	(317)	(472)
Net income (loss)	$ 1,795	$ (1,332)	$ 548	$ (740)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.66	$ (0.49)	$ 0.20	$ (0.27)
Diluted (in dollars per share)	$ 0.65	$ (0.49)	$ 0.19	$ (0.27)
Weighted-average common shares outstanding:
Basic (in shares)	2,711	2,707	2,706	2,701
Diluted (in shares)	2,778	2,707	2,775	2,701