RETIREMENT BENEFIT PLANS (Details Narrative) - USD ($)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Accrued amount for non discretionary safe harbor contribution	$ 519,177	$ 550,286
Pension Benefit [Member]
Discount rate	2.61%	3.81%
Net amount recognized in accrued benefit liability	$ (33,188,623)	$ (28,631,485)
2021	4,400,000	4,300,000
2022	4,600,000	4,500,000
2023	4,800,000	4,700,000
2024	5,000,000.0	4,900,000
2025	5,200,000	5,100,000
2026 through 2030	28,100,000	28,000,000
Cash contributions	3,100,000
Dividend received	95,488	95,488
Fair value of plan assets at beginning of year	78,361,102	74,359,558
Pension Benefit [Member] | Eastern Company Common Stock [Member]
Fair value of plan assets at beginning of year	$ 5,230,134	$ 6,625,560
Other Postretirement Benefit [Member]
Discount rate	3.35%	4.26%
Net amount recognized in accrued benefit liability	$ (1,185,139)	$ (1,007,146)
2021	49,000
2022	50,000
2023	51,000
2024	52,000
2025	54,000
2026 through 2030	302,000
Cash contributions	$ 50,000
Minimum [Member] | Pension Benefit [Member]
Discount rate	3.18%	4.20%
Minimum [Member] | Pension Benefit Plans and Other Postretirement Benefit Plan [Member]
Discount rate	2.40%	3.18%
Maximum [Member] | Pension Benefit [Member]
Discount rate	3.23%	4.22%
Maximum [Member] | Pension Benefit Plans and Other Postretirement Benefit Plan [Member]
Discount rate	2.48%	3.23%