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Note 15 - Fair Value Disclosure of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |
|  | Carrying Amounts |  |  | Estimated Fair Value |  |  | Carrying Amounts |  |  | Estimated Fair Value |
Notes payable (1) |  | $ | 4,596,140 |  |  | $ | 4,601,479 |  |  | $ | 3,927,251 |  |  | $ | 3,890,797 |
Mortgages payable (2) |  | $ | 882,787 |  |  | $ | 881,427 |  |  | $ | 1,139,117 |  |  | $ | 1,141,047 |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | Balance at December 31, 201 7 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  | $ | 11,936 |  |  | $ | 11,936 |  |  | $ | - |  |  | $ | - |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 344 |  |  | $ | - |  |  | $ | 344 |  |  | $ | - |
|  | Balance at December 31, 201 6 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity securities |  | $ | 6,502 |  |  | $ | 6,502 |  |  | $ | - |  |  | $ | - |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 975 |  |  | $ | - |  |  | $ | 975 |  |  | $ | - |
|  | Balance at December 31, 201 7 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Real estate |  | $ | 108,313 |  |  | $ | - |  |  | $ | - |  |  | $ | 108,313 |
|  | Balance at December 31, 201 6 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Real estate |  | $ | 117,930 |  |  | $ | - |  |  | $ | - |  |  | $ | 117,930 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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