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Commitments and contingencies | 12 Months Ended
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Dec. 31, 2023
Commitments and contingencies |
Commitments and contingencies | Note 11 - Commitments and contingencies Rents and operating leases 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
Baton Rouge, Louisiana | ​ | $ | 30,000 |  | 5/2024
Champaign, Illinois | ​ | $ | 609,000 |  | 12/2024
Champaign, Illinois (2nd location) | ​ | $ | 349,000 | ​ | 9/2026
Charlotte, North Carolina | ​ | $ | 38,000 |  | 5/2025
Escondido, California | ​ | $ | 238,000 |  | 6/2027
Long Beach, California | ​ | $ | 28,800 |  | 2/2024*
Ontario, California | ​ | $ | 174,000 |  | 12/2024
Riverside, California | ​ | $ | 27,000 |  | Month to Month
Rantoul, Illinois | ​ | $ | 36,000 | ​ | Month to Month
Smyrna, Georgia | ​ | $ | 492,000 |  | 7/2030
Stony Point, New York | ​ | $ | 118,000 |  | 6/2026
Woodcliff Lake, New Jersey | ​ | $ | 236,000 | ​ | 8/2027
* | Lease was renewed on March 1, 2024.
The Company rents properties and various equipment under operating leases. Operating lease expense for the years ended December 31, 2023, 2022 and 2021 totaled approximately $1.7 million, $2.6 million and $3.1 million. In addition to the properties above, the Company does at times utilize public warehouse space on a month to month basis. The Company typically enters into short-term leases for the facilities and wherever possible extends the expiration date of such leases.

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