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Note 3 - Liquidity and Going Concern (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended | 16 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2018 | Apr. 30, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 15, 2021
Cumulative Net Loss |  |  |  |  | $ (14,000,000) |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | 5,426,601 | $ 303,000 |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  | $ 1,500,000 |  |
Equity Financing Arrangement [Member] |  |  |  |  |  |  |
Restricted Cash, Total |  | $ 500,000 |  |  |  |  |
Equity Financing Arrangement [Member] | Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 400,000 |  |
Equity Financing Arrangement [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Value of Shares Issuable to Other Investor |  |  |  | $ 2,000,000 |  |  |
LF International Pte [Member] | Equity Financing Arrangement [Member] |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  | $ 1 |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  | $ 1,300,000 | $ 700,000 | $ 2,500,000 |  |  |
LF International Pte [Member] | Equity Financing Arrangement [Member] | Common Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 260,000 | 140,000 |  |  |  |
LF International Pte [Member] | Equity Financing Arrangement [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 5,000,000 |  |  |
Other Investor [Member] | Equity Financing Arrangement [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  | $ 1,000,000
PNC [Member] | PNC Agreements, Amendment Two [Member] |  |  |  |  |  |  |
Debt Instrument, Covenant, Required Proceeds from Equity Issuance | $ 7,500,000 |  |  |  |  |  |

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