Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and contingencies

Schedule of rent expense

The Company utilizes leased facilities and operates equipment under non-cancelable operating leases through July 2030. Below is a table of key properties:

			Lease
	Annual		Expiration
Location	Rent		Date
Auburn, Washington	$	36,000	4/2022
Baton Rouge, Louisiana	$	24,600	Month to Month
Champaign, Illinois	$	654,000	12/2024
Champaign, Illinois (2nd location)	$	349,000	9/2026
Charlotte, North Carolina	$	31,000	5/2022
Escondido, California	$	219,000	6/2022
Hampstead, New Hampshire	$	33,000	8/2023
Long Beach, California	$	28,800	2/2024
Ontario, California	$	168,000	12/2024
Riverside, California	$	27,000	Month to Month
Rantoul, Illinois	$	36,000	Month to Month
Smyrna, Georgia	$	465,000	7/2030
Stony Point, New York	$	105,000	6/2022
Woodcliff Lake, New Jersey	$	158,000	8/2027