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Note 1 - Nature of Business and Basis of Presentation - Adoption of ASC 842 Impact (Details) - USD ($) | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating lease right-of-assets | $ 532,757 | $ 602,937 | $ 0
Prepaid expenses and other | 161,997 | 138,216 | 150,811
Total assets | 11,155,835 | 12,282,674 | 11,692,332
Operating lease liabilities, current portion | 141,068 | 135,519 | 0
Operating lease liabilities, net of current portion | 383,028 | 454,823 | 0
Total liabilities | 3,081,776 | 1,816,452 | 1,226,110
Total liabilities and stockholders’ equity | $ 11,155,835 | 12,282,674 | $ 11,692,332
Accounting Standards Update 2016-02 [Member] |  |  |
Operating lease right-of-assets |  | 602,937 |
Prepaid expenses and other |  | (12,595) |
Total assets |  | 590,342 |
Operating lease liabilities, current portion |  | 135,519 |
Operating lease liabilities, net of current portion |  | 454,823 |
Total liabilities |  | 590,342 |
Total liabilities and stockholders’ equity |  | $ 590,342 |

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