Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common shares	Capital in excess of par	Retained earnings	Treasury shares	Total
Balance at (in shares) at Jan. 02, 2016	2,574,264			913,097
Balance at at Jan. 02, 2016	$ 643	$ 1,817	$ 61,483	$ 15,527
Consolidated Statements of Shareholders' Equity
Net income			3,686		$ 3,686
Compensation of Board of Directors by issuance of treasury shares (in shares)				(12,000)
Compensation of Board of Directors by issuance of treasury shares		(52)		$ (204)
Purchase of treasury shares (in shares)				2,000	(2,000)
Purchase of treasury shares				$ 50
Balance at (in shares) at Dec. 31, 2016	2,574,264			903,097
Balance at at Dec. 31, 2016	$ 643	1,765	65,169	$ 15,373	$ 52,204
Consolidated Statements of Shareholders' Equity
Net income			1,818		$ 1,818
Compensation of Board of Directors by issuance of treasury shares (in shares)				(12,000)
Compensation of Board of Directors by issuance of treasury shares		122		$ (204)
Purchase of treasury shares (in shares)				1,000	(1,000)
Purchase of treasury shares				$ 26
Balance at (in shares) at Dec. 30, 2017	2,574,264			892,097
Balance at at Dec. 30, 2017	$ 643	$ 1,887	$ 66,987	$ 15,195	$ 54,322