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Note 3 - Liquidity and Going Concern Considerations (Details Textual) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 15, 2021 | Dec. 30, 2020 | Sep. 25, 2020 | Aug. 21, 2020 | Aug. 11, 2020 | Apr. 28, 2020 | Mar. 27, 2020 | Jan. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jul. 20, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Aug. 03, 2020
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  | $ 1,263,875 | $ (324,690) | $ 1,568,440 | $ (1,691,488) | $ (5,900,000) |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  |  |  |  | (183,123,628) |  | (183,123,628) |  | (184,692,067) |  |  |  |
Working Capital |  |  |  |  |  |  |  |  |  |  | (2,900,000) |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  | 9,109,098 |  | 9,109,098 |  | 10,082,549 |  |  |  |
Sale of Promissory Note, Periodic Purchase Amount |  |  |  |  |  |  | $ 148,000 |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Current |  |  |  |  |  |  |  |  | 249,783 |  | 249,783 |  | 2,186,197 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Number of Common Shares to be Outstanding After Merger (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |
Percent of Common Shares Issuable to Shareholders After Merger |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Tranche from ESOUSA Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Current |  |  |  |  |  |  |  |  | 145,000 |  | 145,000 |  |  |  | $ 145,000 | $ 145,000 |
Esousa Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Promissory Note, Percent of Gross Proceeds of Equity Sale Used to Finance Purchase of Note |  |  |  |  |  |  | 88.00% |  |  |  |  |  |  |  |  |  |
Sale of Promissory Note, Periodic Purchase Amount |  |  |  |  |  |  | $ 148,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Notes Payable |  |  |  |  |  | $ 143,000 | 148,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 50,000 | 45,654 | 66,190 | 65,862 |  | 200,000 |  |  |  |  |  |  |  |  |
RBL Capital Group, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Notes Payable |  | $ 1,960,000 | $ 426,000 | $ 401,000 | $ 707,000 | $ 143,000 | 148,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable with Imputed Interest, Face Amount |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Receivable with Imputed Interest, Effective Yield (Interest Rate) |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  |
RBL Capital Group, LLC [Member] | Tranche from ESOUSA Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Accrued Liabilities, Current |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |
Mullen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable with Imputed Interest, Face Amount |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Receivable with Imputed Interest, Effective Yield (Interest Rate) |  |  |  |  | 14.00% |  |  |  |  |  |  |  |  |  |  |  |
Registration Filing, Late Fee Per Day | $ 13,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registration Filing, Late Fees Owed |  |  |  |  |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |  |  |
Mullen [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Merger Agreement, Required Aggregate Cash and Cash Equivalents Less Payable and Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |
Receivable with Imputed Interest, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Promissory Note Issued to RBL Capital Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  | $ 15,000,000

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