Note 4 - Stock-based Compensation (Details Textual)	3 Months Ended	6 Months Ended
Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)
Number of Stock-based Compensation Plans in Effect	2		2
Share-Based Payment Arrangement, Expense	$ 150,000	$ 150,000	$ 150,000	$ 160,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0		$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) \| shares	0		0
The 2020 Non-employee Director Stock Option Plan [Member] \| Three Independent Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross \| shares	6,021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Value	$ 150,000

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Gross number of share options (or share units) granted during the period.

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