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Note 6 - Financial Instruments and Fair Value (Details Textual)	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2011 USD ($)
Real Estate Held-for-sale	$ 1,200,000	$ 1,000,000			$ 1,200,000		$ 6,100,000
Asset Impairment Charges	$ 469,000					$ 8,236,000			$ 427,000	$ 1,000,000
Impairment of Real Estate			$ 400,000	$ 7,100,000
Number of Real Estate Properties Sold During Period	2	1					4
Auction Rate Securities [Member]
Available-for-sale Securities	$ 6,375,000				6,375,000		$ 6,231,000
Available-for-sale Securities, Amortized Cost Basis	6,375,000				$ 6,375,000		6,700,000
Auction Rate Securities Redeemed	$ 325,000						$ 450,000	$ 275,000	$ 150,000
Derivative, Basis Spread on Variable Rate	2.25%				2.25%

X

- Definition

Represents the redemption of auction rate securities.

+ References

No definition available.

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X

- Definition

The number of real estate properties sold during the period.

+ References

No definition available.

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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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- Definition

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

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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