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Financial instruments | 12 Months Ended
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Dec. 31, 2022
Financial instruments |
Financial instruments | 18. Financial instruments Credit risk: The Company is not exposed to significant credit risk on its retail customer accounts as its policy is to cease supply of water to customers’ accounts that are more than 45 days overdue. The Company’s exposure to credit risk is concentrated on receivables from its bulk water, services, and manufacturing customers. The Company considers these receivables fully collectible and therefore has not recorded an allowance for these receivables. Interest rate risk: The Company is not subject to significant interest rate risk arising from fluctuations in interest rates. Foreign exchange risk: All relevant foreign currencies other than the Mexican peso and the euro have been fixed to the dollar for more than 20 years and as a result, the Company does not employ a hedging strategy against exchange rate risk associated with the reporting in dollars. If any of these fixed exchange rates becomes a floating exchange rate or if any of the foreign currencies in which the Company conducts business depreciate significantly against the dollar, the Company’s consolidated results of operations could be adversely affected. Fair values: As of December 31, 2022 and 2021, the carrying amounts of cash equivalents, accounts receivable, accounts payable, accrued expenses, accrued compensation, dividends payable and other current liabilities approximate their fair values due to the short-term maturities of these instruments. Under US GAAP, fair value is defined as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. US GAAP guidance also establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability. The guidance establishes three levels of inputs that may be used to measure fair value: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurements. The Company reviews its fair value hierarchy classifications on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The following table presents the Company’s fair value hierarchy for assets and liabilities measured at fair value as of December 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Recurring | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificate of deposit | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Net asset arising from put/call options | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2021
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Recurring | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificate of deposit | ​ | $ | — | ​ | $ | 2,500,000 | ​ | $ | — | ​ | $ | 2,500,000
Net asset arising from put/call options | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 128,000 | ​ | ​ | 128,000
​ The activity for the Level 3 asset for the year ended December 31, 2022: ​
​ | ​ | ​ | ​
Net asset arising from put/call options |  | ​ | ​
Balance as of December 31, 2021 | ​ | $ | 128,000
Exercise of option | ​ |  | (128,000)
Balance as of December 31, 2022 | ​ | $ | —
​ The put/call options are reported at fair value at their net asset or liability balance in the consolidated balance sheets. The underlying asset and liability fair values are calculated using discounted cash flow analysis valuation techniques that incorporate unobservable inputs, such as future cash flows, weighted-average cost of capital, and expected future volatility. The inputs to these valuations are considered Level 3 inputs.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
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- References No definition available. + Details
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