Note 3 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	9.80%	22.10%	2.30%	19.40%
Deferred Tax Liabilities, Employer Social Security Tax Break Under CARES Act	$ 237,000		$ 237,000