Note 9 - Fair Value of Financial Instruments - Interest Rate Caps in Connection With Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Estimated fair market value	$ 24	$ 182
Interest Rate Cap 1 [Member]
Notional amount	$ 410,000
Maturity date	Dec. 15, 2018
Strike rate	2.00%
Estimated fair market value		148
Interest Rate Cap 2 [Member]
Notional amount	$ 73,700
Maturity date	May 09, 2020
Strike rate	3.00%
Estimated fair market value	$ 24	34
Interest Rate Cap 3 [Member]
Notional amount	$ 75,000
Maturity date	Dec. 15, 2020
Strike rate	4.00%
Estimated fair market value

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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