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Note 13 - Summary of Subsequent Events (Details Textual) - USD ($) |  |  | 3 Months Ended | 5 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 01, 2020 | Jan. 13, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | May 18, 2020 | Jan. 03, 2020
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 12,536,389 | $ 13,979,177 |  |
Subsequent Event [Member] |  |  |  |  |  |
Proceeds from Paycheck Protection Program Under CARES Act | $ 1,000,000 |  |  |  |  |
Forecast [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member] |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 482,000 |  |  |  |  |
Forecast [Member] | Series A Preferred Stock [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member] |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 48,200 |  |  |  |  |
Forecast [Member] | Purchase Agreement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  |  |  |  | 500,000
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  |  |  | 10
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 10
Sale of Stock, Offering Amount |  |  |  |  |  | $ 5,000,000
Proceeds from Issuance or Sale of Equity, Total |  |  |  |  | $ 4,926,600 |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 492,660 |
Forecast [Member] | Additional Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 10
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  |  |  |  | 200,000
Forecast [Member] | First Closing of the Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 2,500,000 |  |  |  |
Ziploc [Member] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 2,200,000 |  |  |

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