Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2020
Leasehold Improvements [Member]
Assets, estimated useful life	Shorter of useful lives or the terms of the leases
Minimum [Member] | Building [Member]
Assets, estimated useful life (Year)	15 years
Minimum [Member] | Building Improvements [Member]
Assets, estimated useful life (Year)	5 years
Minimum [Member] | Furniture Fixtures and Equipment [Member]
Assets, estimated useful life (Year)	3 years
Maximum [Member] | Building [Member]
Assets, estimated useful life (Year)	45 years
Maximum [Member] | Building Improvements [Member]
Assets, estimated useful life (Year)	20 years
Maximum [Member] | Furniture Fixtures and Equipment [Member]
Assets, estimated useful life (Year)	25 years