Note 1 - Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2021
Details
Accounting Standards Update and Change in Accounting Principle	In August 2018, the FASB issued ASU No. 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The update removes, modifies and makes additions to the disclosure requirements on fair value measurements. The update is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The adoption of this update on January 1, 2020 had no impact on the financial statements.