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Note 10 - Credit Quality of Rents Receivable (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Summary of Valuation Allowance [Table Text Block] |
Allowance for Doubtful Accounts |  | December 31, 2019 |  |  | December 31, 2018 |
Beginning balance |  | $ | 13,000 |  |  | $ | 34,000 |
Accounts receivable (written off) |  |  | (13,000 | ) |  |  | (21,000 | )
Ending Balance |  | $ | - |  |  | $ | 13,000 |

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