Segment Information - Financial Data by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 191,500,947	$ 193,962,357
Operating income	13,188,617	6,273,302
Assets	149,241,316	164,377,104
Additions to property, plant and equipment	4,673,000	4,305,000
Depreciation and amortization	5,011,000	4,578,000
United States Segment
Net sales	163,205,000	165,205,000
Operating income	11,477,000	4,783,000
Assets	131,382,000	144,466,000
Additions to property, plant and equipment	4,626,000	4,174,000
Depreciation and amortization	4,833,000	4,398,000
Canada Segment
Net sales	13,891,000	13,779,000
Operating income	866,000	1,136,000
Assets	8,557,000	9,078,000
Additions to property, plant and equipment		52,000
Depreciation and amortization	102,000	96,000
Europe Segment
Net sales	14,405,000	14,978,000
Operating income	845,000	354,000
Assets	9,302,000	10,833,000
Additions to property, plant and equipment	47,000	79,000
Depreciation and amortization	$ 76,000	$ 84,000