CONCENTRATIONS AND CREDIT RISK	12 Months Ended
Dec. 31, 2021
CONCENTRATIONS AND CREDIT RISK
CONCENTRATIONS AND CREDIT RISK	NOTE 9. CONCENTRATIONS AND CREDIT RISK Major Customers No customer accounted for more than 10% of total revenue for the years ended December 31, 2021, 2020 or 2019. No customer accounted for more than 10% of total receivables as of December 31, 2021 or 2020. Credit Risk Concentration We maintain most of our cash and cash equivalents with nationally recognized financial institutions. Substantially all balances are uninsured and are not used as collateral for other obligations. Concentrations of credit risk on accounts receivable are believed to be limited due to the number, diversification and character of the obligors and our credit evaluation process. Credit risk associated with a portion of the Company’s trade receivables may be reduced by our ability to submit claims to the Oil Spill Liability Trust Fund (“OSLTF”) for reimbursement of unpaid customer receivables related to services regulated under the provisions of the Oil Pollution Act of 1990. As of December 31, 2021, the Company did not have any trade receivables that are eligible for submission to the OSLTF for reimbursement. Labor Concentrations As of December 31, 2021, approximately 500, or approximately 13%, of our employees were covered by collective bargaining agreements with various labor unions. Approximately 40% of these employees are covered by collective bargaining agreements that expired and are in negotiation as of December 31, 2021, or expire within one year of December 31, 2021.

CONCENTRATIONS AND CREDIT RISK

12 Months Ended

Dec. 31, 2021

NOTE 9. CONCENTRATIONS AND CREDIT RISK

Major Customers

No customer accounted for more than 10% of total revenue for the years ended December 31, 2021, 2020 or 2019.

No customer accounted for more than 10% of total receivables as of December 31, 2021 or 2020.

Credit Risk Concentration

We maintain most of our cash and cash equivalents with nationally recognized financial institutions. Substantially all balances are uninsured and are not used as collateral for other obligations. Concentrations of credit risk on accounts receivable are believed to be limited due to the number, diversification and character of the obligors and our credit evaluation process. Credit risk associated with a portion of the Company’s trade receivables may be reduced by our ability to submit claims to the Oil Spill Liability Trust Fund (“OSLTF”) for reimbursement of unpaid customer receivables related to services regulated under the provisions of the Oil Pollution Act of 1990. As of December 31, 2021, the Company did not have any trade receivables that are eligible for submission to the OSLTF for reimbursement.

Labor Concentrations

As of December 31, 2021, approximately 500, or approximately 13%, of our employees were covered by collective bargaining agreements with various labor unions. Approximately 40% of these employees are covered by collective bargaining agreements that expired and are in negotiation as of December 31, 2021, or expire within one year of December 31, 2021.