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Note 4 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Restrictions on Cash and Cash Equivalents [Table Text Block] |
|  | June 30, 2021 |  |  | December 31, 2020 |
Cash on consolidated balance sheet |  | $ | 3,926,150 |  |  | $ | 4,541,013 |
Restricted cash |  |  | 980,907 |  |  |  | 780,998 |
Total cash and restricted cash |  | $ | 4,907,057 |  |  | $ | 5,322,011 |

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