Note 1 - Organization and Summary of Significant Accounting Policies - Property and Equipment Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Building and Building Improvements [Member] | Minimum [Member]
Property and equipment useful life (Year)	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property and equipment useful life (Year)	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property and equipment useful life (Year)	5 years
Furniture and Equipment [Member] | Maximum [Member]
Property and equipment useful life (Year)	12 years