XML 44 R30.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Commitments and contingencies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
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
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

X
- Definition Tabular disclosure of Schedule of Operating Lease in annual rent. + References No definition available. + Details
Name: | hdsn_ScheduleOfOperatingLeaseInAnnualRentTableTextBlock
Namespace Prefix: | hdsn_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration