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Note 14 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2021 $ / shares | Apr. 09, 2021 USD ($) $ / shares shares | Jun. 08, 2020 USD ($) $ / shares shares | Jun. 03, 2020 $ / shares shares | Apr. 08, 2020 USD ($) $ / shares shares | Nov. 30, 2021 USD ($) $ / shares shares | Jul. 31, 2021 USD ($) $ / shares shares | Nov. 27, 2020 USD ($) shares | Jul. 31, 2020 $ / shares shares | May 31, 2020 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Feb. 28, 2020 $ / shares shares | Jan. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2018 shares | Aug. 31, 2020 USD ($) $ / shares shares | Nov. 30, 2021 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) $ / shares shares | Oct. 25, 2020 $ / shares | Feb. 29, 2020 $ / shares | Oct. 31, 2018 $ / shares shares
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 2,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 21.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Offering, Underwriting Discounts, Commissions, and Offering Expenses | $ |  |  |  |  |  |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ |  |  |  |  |  |  | $ 56,000 |  |  |  |  |  |  |  |  | $ 55,952 | $ 0 |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |
Dividends Payable | $ |  |  |  |  |  | $ 1,043 |  |  |  |  |  |  |  |  |  | $ 1,043 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |
Share Price (in dollars per share) | $ / shares |  |  | $ 6.00 |  | $ 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Warrants Exercised | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,277 | $ 8,028 |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 585,739 | 4,207,667 |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,225 |  |  |
Warrant Inducement Expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0) | 845 |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  | 7,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payroll Expense | $ |  |  | $ 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be Issued, Value | $ |  |  | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued in April 2020 Exchange [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 149,842 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period, Per Unit (in shares) |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Accrued Interest into Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.50 |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 49,842 |  |  |  |  |  |  |
Stock Issued During Period, Value, Warrants Exercised | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Warrants Issued Per $1000 (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |
Accrued Interest Satisfied By Issuance of Warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Warrants Issued to Consultants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 1.55 |  |  | $ 2.50 |  |  |  |  |  |  |  |
Class of Warrant Or Right, Granted in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  | 68,319 |  |  |  |  |  |  |  |  |  |  |
Warrants Issued with October 2018 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.50 |  | $ 2.50
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  | 189,079 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  | 189,079 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued with 2017 Financing, Exercise Price 1.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  | 57,235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued with 2017 Financing, Exercise Price 1.80 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 1,777,388 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued with 2017 Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,834,623 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,834,623 |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,300 |  |  |  |  |
Warrants Issued with Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.50 |  |  |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,261 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,261 |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  | 1,997,911 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.80 | $ 1.60 |  |  |  |  |  |  |  | $ 2.50 |
Stock Issued During Period, Value, Warrants Exercised | $ |  |  |  |  |  |  |  |  |  |  | $ 3,200 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  |  | 11,793 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  | 11,793 | 1,997,911 |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |  |  |  |  |  |
Warrant Inducement Expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 |  |  |
Warrants with Exercise Price of 2.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.50 |  |  |  |  |  |  |  |  |  | $ 2.50 |  |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510,739 |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510,739 |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |
Incentive Stock Warrants [Member] | Marketing Consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.155 |  |  |  |  |  |  |  | $ 2.50 |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |
Class of Warrant Or Right, Granted in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  | 15,000 |  |  |
Class of Warrant or Right, Exercised in Period (in shares) |  |  |  |  |  | 75,000 |  |  | 75,000 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  | 68,005 |  |  | 68,005 |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 8,000.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ |  |  |  |  | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  | 1,391 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | $ |  |  |  |  | $ 11,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ |  |  |  |  | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 5,000.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable | $ |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  | 4,636,649 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  | 695,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  |  | 3,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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