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Intangible assets - Costs and accumulated amortization (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Cost
Finite-Lived Intangible Assets, Gross	$ 9,890,000	$ 9,890,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(5,741,667)	(4,850,000)
Intangible assets, net	4,148,333	5,040,000
Non-compete agreements
Cost
Finite-Lived Intangible Assets, Gross	530,000	530,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(443,889)	(320,556)
Trade names
Cost
Finite-Lived Intangible Assets, Gross	2,700,000	2,700,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(560,000)	(380,000)
Certifications/programs
Cost
Finite-Lived Intangible Assets, Gross	2,000,000	2,000,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(2,000,000)	(2,000,000)
Customer backlogs
Cost
Finite-Lived Intangible Assets, Gross	460,000	460,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(310,000)	(130,000)
Customer relationships
Cost
Finite-Lived Intangible Assets, Gross	2,000,000	2,000,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	(2,000,000)	(1,958,333)
Facility management contracts
Cost
Finite-Lived Intangible Assets, Gross	2,200,000	2,200,000
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization	$ (427,778)	$ (61,111)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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