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Note 6 - Financial Instruments and Fair Value (Details Textual)	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2011 USD ($)
Asset Impairment Charges, Total					$ 469,000		$ 427,000	$ 1,000,000
Impairment of Real Estate						$ 7,500,000
Number of Real Estate Properties Sold During Period	1	1			7	7
Real Estate Held-for-sale	$ 1,000,000	$ 1,900,000			$ 8,300,000	$ 8,300,000
Number of Real Estate Properties Put Back into Service			1
Real Estate Previously Held-for-sale Put Back Into Service			$ 1,400,000
Auction Rate Securities [Member]
Debt Securities, Available-for-sale, Total				$ 6,000,000	6,400,000
Auction Rate Securities Redeemed				$ 350,000	$ 325,000	$ 450,000
Derivative, Basis Spread on Variable Rate				2.25%

X

- Definition

Represents the redemption of auction rate securities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the number of real estate properties previously classified as "held for sale" are put back into service during the period.

+ References

No definition available.

+ Details

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X

- Definition

The number of real estate properties sold during the period.

+ References

No definition available.

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X

- Definition

Represents the fair value of real estate previously held-for-sale that are put back into service during the period.

+ References

No definition available.

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X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

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X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Subparagraph (b)
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X

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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