Stock Compensation Plans - Stock option transactions (Details) - $ / shares	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding at beginning of year	35,000	44,250	72,375
Options, Issued during year	0	0	0
Options, Canceled or expired	(5,000)
Options, Exercised during year	(10,000)	(9,250)	(28,125)
Options, Outstanding at end of year	20,000	35,000	44,250
Options, Exercisable at end of year	6,666	15,000	24,250
Weighted-average fair value of options granted during the year	$ 0.00	$ 0.00	$ 0.00
Weighted Average Exercise Price, Issued during year	0.00		0.00
Weighted Average Exercise Price, Canceled or expired	11.86
Weighted Average Exercise Price, Exercised during year	11.86	5.85
Weighted Average Grant Date Fair Value, Outstanding at end of year	14.39
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Outstanding at beginning of year	14.39	14.39	14.39
Weighted Average Exercise Price, Exercised during year			5.85
Weighted Average Grant Date Fair Value, Outstanding at end of year		14.39	14.39
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value, Outstanding at beginning of year	$ 11.86	5.85	5.28
Weighted Average Exercise Price, Exercised during year			5.28
Weighted Average Grant Date Fair Value, Outstanding at end of year		$ 11.86	$ 5.85