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Note 9 - Financial Instruments and Fair Value (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2011 USD ($)
Asset Impairment Charges |  | $ 469,000 |  | $ 8,247,000 |  | $ 427,000 | $ 1,000,000
Impairment of Real Estate |  |  |  | $ 7,500,000 |  |  |
Number of Real Estate Properties Sold During Period |  |  | 3 | 4 |  |  |
Real Estate Held-for-sale |  |  | $ 2,200,000 | $ 6,100,000 |  |  |
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] |  |  |  |  |  |  |
Available-for-sale Securities |  |  | 6,375,000 | 6,231,000 |  |  |
Available-for-sale Securities, Amortized Cost Basis |  |  | $ 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% |  |  |  |

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- 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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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References 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) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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