CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Increase (Decrease) in Shareholders' Equity
BALANCE AT DECEMBER 28, 2019	$ 22,837	$ 186,229	$ (12,594)	$ 196,472
Balance at December 29,2019, as previously reported	22,837	186,229	(12,594)	196,472
BALANCE at Dec. 29, 2018	$ 22,837	186,229	(12,594)	196,472
BALANCE (in shares) at Dec. 29, 2018	8,010,480
Increase (Decrease) in Shareholders' Equity
BALANCE AT DECEMBER 28, 2019	$ 20,537	189,235	(11,882)	197,890
Balance at December 29,2019, as previously reported	20,537	189,235	(11,882)	197,890
Net income		4,665		4,665
Foreign currency translation adjustment			712	712
Exercise of stock options	$ 1,526			1,526
Exercise of stock options (in shares)	64,700
Share-based compensation expense	$ 911			911
Restricted shares vesting (in shares)	25,484
Redemption of vested employee restricted shares for tax withholding	$ (388)			(388)
Redemption of vested employee restricted shares for tax withholding (in shares)	(8,157)
Shares repurchased	$ (4,349)			(4,349)
Shares repurchased (in shares)	(86,609)
Accrued dividends on unvested shares		(8)		(8)
Cash paid on dividend equivalents		(35)		(35)
Cash dividends paid to shareholders (per share)		(1,616)		(1,616)
BALANCE at Mar. 30, 2019	$ 20,537	189,235	(11,882)	197,890
BALANCE (in shares) at Mar. 30, 2019	8,005,898
Increase (Decrease) in Shareholders' Equity
BALANCE AT DECEMBER 28, 2019	$ 20,537	189,235	(11,882)	197,890
Balance at December 29,2019, as previously reported	20,537	189,235	(11,882)	197,890
BALANCE AT DECEMBER 28, 2019	9,265	200,249	(11,763)	197,751
Balance at December 29,2019, as previously reported	9,265	200,249	(11,763)	197,751
Cumulative effect of a change in accounting principle related to ASC 326		(203)		(203)
Balance at December 29,2019, as adjusted	9,265	200,046	(11,763)	197,548
BALANCE at Dec. 28, 2019	$ 9,265	200,249	(11,763)	$ 197,751
BALANCE (in shares) at Dec. 28, 2019	7,814,797			7,814,797
Increase (Decrease) in Shareholders' Equity
BALANCE AT DECEMBER 28, 2019	$ 5,871	204,679	(14,190)	$ 196,360
Balance at December 29,2019, as previously reported	5,871	204,679	(14,190)	196,360
Net income		6,468		6,468
Foreign currency translation adjustment			(2,427)	(2,427)
Exercise of stock options	$ 151			151
Exercise of stock options (in shares)	8,200
Share-based compensation expense	$ 655			655
Restricted shares vesting (in shares)	23,884
Redemption of vested employee restricted shares for tax withholding	$ (390)			(390)
Redemption of vested employee restricted shares for tax withholding (in shares)	(7,843)
Shares repurchased	$ (3,810)			(3,810)
Shares repurchased (in shares)	(82,613)
Accrued dividends on unvested shares		1		1
Cash paid on dividend equivalents		(40)		(40)
Cash dividends paid to shareholders (per share)		(1,796)		(1,796)
BALANCE at Mar. 28, 2020	$ 5,871	204,679	(14,190)	$ 196,360
BALANCE (in shares) at Mar. 28, 2020	7,756,425			7,756,425
Increase (Decrease) in Shareholders' Equity
BALANCE AT DECEMBER 28, 2019	$ 5,871	204,679	(14,190)	$ 196,360
Balance at December 29,2019, as previously reported	$ 5,871	$ 204,679	$ (14,190)	$ 196,360