Note 18 - Subsequent Events (Details Textual) $ in Thousands	2 Months Ended	12 Months Ended			14 Months Ended
	Mar. 15, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 15, 2020
Number of Real Estate Properties Sold		20	1	3
Proceeds from Sale of Real Estate, Total		$ 138,500	$ 5,700	$ 11,700
Proceeds from Sale of Real Estate, Net of Prepayment Costs		37,300
Repayment of Long-term Debt and Closing Costs, Estimated		149,900
Long-term Debt, Gross		$ 1,473,166	1,513,000
Number of Real Estate Properties Collateralize by Debt Agreement		78
Hilton Garden Inn Blacksburg [Member]
Equity Method Investment, Ownership Percentage		56.50%
Mortgages [Member]
Long-term Debt, Gross		$ 232,000
Number of Real Estate Properties Collateralize by Debt Agreement		21
Mortgages [Member] | Hilton Garden Inn Blacksburg Joint Venture Loan [Member]
Long-term Debt, Gross		$ 10,500	$ 10,500
Subsequent Event [Member]
Number of Real Estate Properties Sold	17				17
Proceeds from Sale of Real Estate, Total	$ 130,000
Proceeds from Sale of Real Estate, Net of Prepayment Costs	19,000
Repayment of Long-term Debt and Closing Costs, Estimated	$ 111,000