Note 3 - Operating Property Activities - Purchase Price Allocation (Details) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Allocation	$ 31,269
Tenant Improvements [Member]
Weighted-average amortization period (Year)	20 years
Allocation	$ 1,637
Leases, Acquired-in-Place [Member]
Weighted-average amortization period (Year)	20 years
Allocation	$ 4,118
Land [Member]
Allocation	8,266
Building [Member]
Allocation	$ 15,935
Weighted-average amortization period (Year)	50 years
Building Improvements [Member]
Allocation	$ 1,313
Weighted-average amortization period (Year)	45 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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