Consolidated Condensed Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 30, 2017
Common stock, par value	$ 3.00	$ 3.00
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	15,482,073	15,279,812
Class B Common stock, par value	$ 3.00	$ 3.00
Class B Common stock, shares authorized	16,000,000	16,000,000
Class B Common stock, shares issued	936,804	861,499