Concentration of risk (Details Narrative) - USD ($)	9 Months Ended
	Oct. 03, 2020	Aug. 30, 2019
Term Loan [Member] | Interest Rate Swap [Member]
Interest rate swap, notional amount	$ 47,500,000	$ 50,000,000
Minimum [Member] | Term Loan [Member]
Basis spread on variable rate	1.25%
Credit risk percentage	1000.00%
Minimum [Member] | Revolving Credit Loan [Member]
Basis spread on variable rate	0.25%
Minimum [Member] | Revolving Credit Loan [Member] | LIBOR [Member]
Basis spread on variable rate	1.25%
Maximum [Member] | Term Loan [Member]
Basis spread on variable rate	2.25%
Credit risk percentage	1300.00%
Maximum [Member] | Revolving Credit Loan [Member]
Basis spread on variable rate	1.25%
Maximum [Member] | Revolving Credit Loan [Member] | LIBOR [Member]
Basis spread on variable rate	2.25%