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Retirement Benefit Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Pension Benefit [Member]        
Service Cost $ 216,153 $ 269,744 $ 648,459 $ 809,231
Interest Cost 990,053 608,188 2,970,160 1,824,568
Expected Return On Plan Assets (1,049,016) (1,460,658) (3,147,046) (4,381,980)
Amortization Of Prior Service Cost 0 16,563 0 49,689
Amortization Of The Net Loss 342,866 390,075 1,028,596 1,170,225
Net Periodic Benefit Cost (500,056) 176,088 (1,500,169) 528,267
Other Postretirement Benefit [Member]        
Service Cost 6,486 13,323 19,458 39,969
Interest Cost 14,533 10,988 43,599 32,964
Expected Return On Plan Assets (4,849) (4,400) (14,547) (13,200)
Amortization Of The Net Loss 1,060 1,060 3,180 3,180
Net Periodic Benefit Cost 16,895 2,054 50,685 6,162
Gain On Significant Event $ 335 $ 18,917 $ 1,005 $ 56,751