Revolving Credit Facility (Details) - USD ($) $ in Thousands				3 Months Ended
	May 12, 2020	Mar. 20, 2020	Oct. 27, 2011	May 02, 2020
Revolving Line of Credit
Borrowings under revolving credit facility				$ 43,700
Line of Credit
Revolving Line of Credit
Term of credit facility			5 years
Maximum borrowing capacity	$ 50,000		$ 50,000
Borrowings under revolving credit facility		$ 43,700
Borrowing capacity, accordion feature	25,000
Maximum borrowing capacity including accordion expansion	$ 75,000
Unused commitment fee (as a percent)	0.25%
Amount of outstanding borrowings prior to cash dividend payment within specified period, per covenant	$ 0
Period prior to cash dividend payment when no borrowings may be outstanding, per covenant	30 days
Amount of expected borrowings subsequent to cash dividend payment within specified period, per covenant	$ 0
Period subsequent to cash dividend payment when no borrowings may be expected, per covenant	30 days
Line of Credit | Minimum
Revolving Line of Credit
Effective interest rate (as a percent)		1.625%
Line of Credit | Maximum
Revolving Line of Credit
Effective interest rate (as a percent)		3.50%
Line of Credit | LIBOR | Minimum
Revolving Line of Credit
Margin added to variable rate (as a percent)	2.25%
Line of Credit | LIBOR | Maximum
Revolving Line of Credit
Margin added to variable rate (as a percent)	2.50%
Line of Credit | Federal Fund Rate
Revolving Line of Credit
Margin added to variable rate (as a percent)	0.50%
Line of Credit | LIBOR, One Month
Revolving Line of Credit
Increase pricing for loans (as a percent)	1.00%
Line of Credit | LIBOR, One Month | Minimum
Revolving Line of Credit
Margin added to variable rate (as a percent)	1.25%
Line of Credit | LIBOR, One Month | Maximum
Revolving Line of Credit
Margin added to variable rate (as a percent)	1.50%