Note 11 - Leases (Details Textual) - USD ($)	Feb. 23, 2019	Dec. 31, 2019	Jul. 02, 2018
Jianping An [Member] | AnHeart [Member]
Ownership Interest, Transferred, Transfer Price	$ 20,000
Building [Member] | Lease for 273 Fifth Avenue, Manhattan,New York [Member]
Lessee, Operating Lease, Term of Contract			30 years
Building [Member] | Lease for 275 Fifth Avenue, Manhattan,New York [Member]
Lessee, Operating Lease, Term of Contract			15 years
Minimum [Member]
Lessee, Operating Lease, Term of Contract		1 year
Maximum [Member]
Lessee, Operating Lease, Term of Contract		5 years