Business Combinations (Details)	1 Months Ended	6 Months Ended	12 Months Ended
Aug. 04, 2020 USD ($)	Jun. 27, 2020 USD ($)	Jun. 29, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investment in businesses		$ 2,740,000	$ 4,480,000
Liabilities assumed		380,000	314,000	$ 1,479,000
Debt issued for purchases of businesses		534,000	1,133,000	2,612,000
Payments to Acquire Businesses, Gross		1,826,000		8,529,000
Cash		0		3,000
Receivables		0		2,332,000
Operating supplies		23,000		84,000
Prepaid expense		0		27,000
Equipment		426,000		1,837,000
Deposits and other		0		96,000
Intangibles		935,000		4,067,000
Goodwill		$ 1,356,000	$ 1,379,000	$ 4,174,000
Subsequent event [Member]
Investment in businesses	$ 2,500,000
Liabilities assumed	0
Debt issued for purchases of businesses	$ 500,000
Number of Businesses Acquired	1
Tradenames [Member]
Finite-Lived Intangible Asset, Useful Life		6 years
Customer lists [Member]
Finite-Lived Intangible Asset, Useful Life		6 years
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life		5 years

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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