Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 264,860	$ 124,590
Cost of sales	54,098	26,981
Gross profit	210,762	97,609
Operating expenses:
Commissions expense	126,598	56,997
Selling, general and administrative expenses (including stock-based compensation expense of $86 and $49 during 2015 and 2014, respectively)	36,024	19,687
Depreciation and amortization	263	105
Total operating expenses	162,885	76,789
Income from operations	47,877	20,820
Other expense, net	(84)	(184)
Income before income taxes	47,793	20,636
Income tax provision	552	266
Net income	47,241	20,370
Preferred stock dividends	0	(10)
Net income available to common stockholders	$ 47,241	$ 20,360
Income per common share:
Basic (in dollars per share)	$ 3.84	$ 1.67
Diluted (in dollars per share)	$ 3.82	$ 1.61
Weighted-average number of common shares outstanding:
Basic (in shares)	12,302	12,131
Diluted (in shares)	12,372	12,600