Segment Information Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 370,785,000	$ 349,637,000
Gross Profit	197,354,000	189,540,000
Operating Income (Loss)	9,066,000	9,210,000
Interest Expense	(603,000)	(1,009,000)
Other Nonoperating Income (Expense)	1,211,000	(1,338,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	9,674,000	6,863,000
Payments to Acquire Property, Plant, and Equipment	2,028,000	2,524,000
Depreciation, Depletion and Amortization	5,893,000	6,855,000
Assets	204,429,000	197,142,000
Notes Receivable, Related Parties	(8,548,000)	(8,141,000)
Lawson [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	329,367,000	313,095,000
Gross Profit	181,567,000	175,517,000
Operating Income (Loss)	6,483,000	7,500,000
Payments to Acquire Property, Plant, and Equipment	1,522,000	1,907,000
Depreciation, Depletion and Amortization	4,757,000	6,008,000
Assets	168,803,000	169,216,000
Bolt [Member] [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	41,418,000	36,542,000
Gross Profit	15,787,000	14,023,000
Operating Income (Loss)	2,583,000	1,710,000
Payments to Acquire Property, Plant, and Equipment	506,000	617,000
Depreciation, Depletion and Amortization	1,136,000	847,000
Assets	$ 44,174,000	$ 36,067,000