Note 8 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Intangible assets accumulated amortization	$ 18,858	$ 15,433
Intangible assets, gross	119,115	99,566
Intangible assets, net	100,257	84,133
Tenant Relationship [Member]
Intangible assets not subject to amortization	73,667	73,667
Intangible assets not subject to amortization, net	73,667	73,667
Trade Names [Member]
Intangible assets not subject to amortization	7,814	3,264
Intangible assets not subject to amortization, net	7,814	3,264
Database Rights [Member]
Intangible assets subject to amortization	4,918	4,918
Intangible assets accumulated amortization	4,365	3,997
Intangible assets subject to amortization, net	553	921
Service Agreements [Member]
Intangible assets subject to amortization	3,680	3,680
Intangible assets accumulated amortization	3,680	3,680
Intangible assets subject to amortization, net	0	0
Customer Relationships [Member]
Intangible assets subject to amortization	27,645	12,646
Intangible assets accumulated amortization	10,274	7,305
Intangible assets subject to amortization, net	17,371	5,341
Leases, Acquired-in-Place [Member]
Intangible assets subject to amortization	1,125
Intangible assets accumulated amortization	328
Intangible assets subject to amortization, net	797
In-place Lease [Member]
Intangible assets subject to amortization		1,125
Intangible assets accumulated amortization		281
Intangible assets subject to amortization, net		844
Noncompete Agreements [Member]
Intangible assets subject to amortization	266	266
Intangible assets accumulated amortization	211	170
Intangible assets subject to amortization, net	$ 55	$ 96