Note 10 - Benefit Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	0.25%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Deferred Compensation Arrangement with Individual, Maximum Base Compensation Deferral Rate	75.00%
Deferred Compensation Arrangement with Individual, Maximum Other Compensation Deferral Rate	100.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage	3.00%
Deferred Compensation Plan Assets	$ 311,000	$ 150,000
Deferred Compensation Liability, Current and Noncurrent, Total	119,000	20,000
The Dominican Plan [Member]
Deferred Compensation Liability, Current and Noncurrent, Total	$ 107,000	$ 44,000