Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
Beginning Balance (in shares) at Jan. 28, 2017						13,434,000		15,329,000
Beginning Balance at Jan. 28, 2017	$ 189,220	$ 29	$ 138,102	$ 51,023	$ 66
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14,700			14,700
Dividends declared	(29,067)			(29,067)
Dividends paid	(20,080)			(20,080)
Shares converted by founders (in shares)						1,141,000		(1,141,000)
Stock-based compensation expense	2,411		2,411
Restricted stock (in shares)						44,000
Exercise of stock options (in shares)						308,000
Exercise of stock options	3,394	0	3,394
Taxes paid in lieu of shares issued for share-based compensation	(101)		(101)
Net change in unrealized gain on available-for-sale securities	(52)				(52)
Ending Balance (in shares) at Feb. 03, 2018						14,927,000		14,188,000
Ending Balance at Feb. 03, 2018	160,425	29	143,984	16,398	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,943			24,943
Dividends declared	(29,453)			(29,453)
Shares converted by founders (in shares)							6,344,000		(6,344,000)
Stock-based compensation expense	2,212		2,212
Restricted stock (in shares)							52,000
Exercise of stock options (in shares)							329,000
Exercise of stock options	3,652		3,652
Taxes paid in lieu of shares issued for share-based compensation (in shares)							(10,000)
Taxes paid in lieu of shares issued for share-based compensation	(111)		(111)
Net change in unrealized gain on available-for-sale securities	212				212
Ending Balance (in shares) at Feb. 02, 2019						21,642,000	21,642,000	7,844,000	7,844,000
Ending Balance at Feb. 02, 2019	163,327	29	149,737	13,335	226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,622			22,622
Dividends declared	(29,677)			(29,677)
Shares converted by founders (in shares)							438,000		(438,000)
Stock-based compensation expense	$ 2,136		2,136
Restricted stock (in shares)							70,000
Exercise of stock options (in shares)	181,001						181,000
Exercise of stock options	$ 1,590	1	1,589
Taxes paid in lieu of shares issued for share-based compensation (in shares)							(8,000)
Taxes paid in lieu of shares issued for share-based compensation	(85)		(85)
Net change in unrealized gain on available-for-sale securities	(12)				(12)
Ending Balance (in shares) at Feb. 01, 2020						22,323,000		7,406,000
Ending Balance at Feb. 01, 2020	$ 159,901	$ 30	$ 153,377	$ 6,280	$ 214