Note 10 - Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Contributions by Employer		$ 85,516	$ 125,276
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		1.00%
Defined Contribution Plan, Employer Matching Contribution, Amount of Cents Per Dollar Increase for Each Additional Percentage Point		50
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		5.00%
Defined Contribution Plan Employee Contribution Limit Below 50 Years of Age		$ 20,500	19,500
Defined Contribution Plan Employee Contribution Limit 50 Years of Age or Older		$ 27,000	$ 26,000
Forecast [Member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 29,541