CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net sales	$ 43,014	$ 41,997	$ 129,534	$ 130,324
Cost of sales	9,037	8,233	25,426	25,781
Gross profit	33,977	33,764	104,108	104,543
Operating expenses:
Commissions and incentives	18,054	18,370	54,361	54,445
Selling and administrative expenses	8,111	8,171	25,706	26,803
Depreciation and amortization expense	475	424	1,521	1,379
Other operating costs	5,667	6,115	22,086	20,447
Total operating expenses	32,307	33,080	103,674	103,074
Income from operations	1,670	684	434	1,469
Interest income	50	10	212	58
Other income (expense), net	(83)	177	681	209
Income before income taxes	1,637	871	1,327	1,736
Income tax benefit (provision)	(3,300)	510	(3,637)	193
Net income (loss)	$ (1,663)	$ 1,381	$ (2,310)	$ 1,929
Earnings (loss) per common share:
Basic (in dollars per share)	$ (0.69)	$ 0.51	$ (0.89)	$ 0.71
Diluted (in dollars per share)	$ (0.69)	$ 0.50	$ (0.89)	$ 0.69
Weighted-average common shares outstanding:
Basic (in shares)	2,396	2,711	2,595	2,708
Diluted (in shares)	2,396	2,766	2,595	2,773