CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 38,319	$ 36,605
Cost of sales	7,222	7,008
Gross profit	31,097	29,597
Operating expenses:
Commissions and incentives	15,598	14,889
Selling and administrative expenses	7,111	6,855
Depreciation and amortization expense	510	520
Other operating costs	5,089	5,322
Total operating expenses	28,308	27,586
Income from operations	2,789	2,011
Interest income, net	22	50
Other expense, net	(282)	(208)
Income before income taxes	2,529	1,853
Income tax (provision) benefit	(335)	934
Net income	$ 2,194	$ 2,787
Earnings per common share:
Basic (in dollars per share)	$ 1.06	$ 1.17
Diluted (in dollars per share)	$ 1.04	$ 1.15
Weighted-average common shares outstanding:
Basic (in shares)	2,071	2,391
Diluted (in shares)	2,116	2,415