CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)	Mar. 28, 2020	Dec. 28, 2019
Current Assets
Accounts receivable, allowances	$ 699,000	$ 556,000
Shareholders' Equity
Voting Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Voting Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Nonvoting Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Nonvoting Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, shares authorized (in shares)	50,000,000	50,000,000
Common Stock, shares issued (in shares)	8,980,460	8,975,434
Common Stock, shares outstanding (in shares)	6,230,731	6,240,705
Treasury Stock, shares (in shares)	2,749,729	2,734,729