Note 16 - Fair Value Disclosure of Financial Instruments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Marketable Securities	$ 8,101	$ 7,565
Asset Impairment Charges	$ 93,266	45,464	$ 217,858
Cost-method Investments, Other than Temporary Impairment		9,000
Debt Securities [Member]
Asset Impairment Charges		800
Other Real Estate Investments [Member]
Asset Impairment Charges		5,300
Sold Sites [Member]
Asset Impairment Charges		10,200
Discontinued Operations [Member]
Asset Impairment Charges		$ 100
Minimum [Member]
Fair Value Inputs, Cap Rate	7.75%	8.25%
Fair Value Inputs, Discount Rate	9.25%	9.25%
Maximum [Member]
Fair Value Inputs, Cap Rate	9.00%	8.50%
Fair Value Inputs, Discount Rate	12.17%	9.75%
Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member]
Impairment of Real Estate	$ 93,300	$ 20,200
Fair Value, Inputs, Level 1 [Member]
Marketable Securities	6,500	5,900
Impairment of Real Estate		5,700
Fair Value, Inputs, Level 3 [Member]
Marketable Securities	$ 1,600	1,700
Impairment of Real Estate		5,600
Fair Value, Inputs, Level 2 [Member]
Impairment of Real Estate		$ 8,900

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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