Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	*Basis of presentation* The accompanying unaudited financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations. Intercompany items have been eliminated in consolidation. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, and filed with the Securities and Exchange Commission. Management believes that the information furnished includes all adjustments of a normal recurring nature that are necessary to fairly present our consolidated financial position, results of operations and cash flows for the periods indicated. The results of operations for any interim period are not necessarily indicative of results to be expected for the full year. The Company refers to the condensed consolidated financial statements collectively as “financial statements,” and individually as “statements of comprehensive income,” “balance sheets,” “statements of shareholders’ equity,” and “statements of cash flows” herein.
New Accounting Pronouncements, Policy [Policy Text Block]	*Recent Accounting Pronouncements* We consider the applicability and impact of all Accounting Standard Updates (“ASUs”). ASUs not listed below were assessed and determined to be not applicable. Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses (Topic 326).” The update changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. The Company adopted the new standard on January 1, 2022 using a modified retrospective transition approach by recognizing a cumulative-effect adjustment of $0.1 million to reduce our opening balance of retained earnings as of the adoption date. Prior period amounts have not been adjusted and continue to reflect our historical accounting. Recently Issued Accounting Pronouncements Not* Yet Adopted* In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” This update provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as interbank offered rates and LIBOR. This guidance includes practical expedients for contract modifications due to reference rate reform. Generally, contract modifications related to reference rate reform may be considered an event that does not require remeasurement or reassessment of a previous accounting determination at the modification date. This guidance may be applied through December 31, 2022. The Company will apply this guidance to transactions and modifications to contracts and hedging relationships that reference LIBOR.

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2022

Basis of Accounting, Policy [Policy Text Block]

Basis of presentation

The accompanying unaudited financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such rules and regulations. Intercompany items have been eliminated in consolidation. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, and filed with the Securities and Exchange Commission. Management believes that the information furnished includes all adjustments of a normal recurring nature that are necessary to fairly present our consolidated financial position, results of operations and cash flows for the periods indicated. The results of operations for any interim period are not necessarily indicative of results to be expected for the full year.

The Company refers to the condensed consolidated financial statements collectively as “financial statements,” and individually as “statements of comprehensive income,” “balance sheets,” “statements of shareholders’ equity,” and “statements of cash flows” herein.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

We consider the applicability and impact of all Accounting Standard Updates (“ASUs”). ASUs not listed below were assessed and determined to be not applicable.

Recently Adopted Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses (Topic 326).” The update changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. The Company adopted the new standard on January 1, 2022 using a modified retrospective transition approach by recognizing a cumulative-effect adjustment of $0.1 million to reduce our opening balance of retained earnings as of the adoption date. Prior period amounts have not been adjusted and continue to reflect our historical accounting.

Recently Issued Accounting Pronouncements Not Yet Adopted

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” This update provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as interbank offered rates and LIBOR. This guidance includes practical expedients for contract modifications due to reference rate reform. Generally, contract modifications related to reference rate reform may be considered an event that does not require remeasurement or reassessment of a previous accounting determination at the modification date. This guidance may be applied through December 31, 2022. The Company will apply this guidance to transactions and modifications to contracts and hedging relationships that reference LIBOR.