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Note 14 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 29, 2021 USD ($) $ / shares shares | Oct. 27, 2020 shares | Mar. 06, 2020 shares | Mar. 31, 2020 shares | Dec. 31, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 USD ($) shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares | Mar. 31, 2015 $ / shares shares | Sep. 30, 2011 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Jan. 31, 2022 shares | Nov. 02, 2021 USD ($) | Jan. 15, 2021 $ / shares shares | Aug. 13, 2019 USD ($) | May 31, 2019 $ / shares | Feb. 29, 2016 $ / shares | Oct. 31, 2015 $ / shares
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 5,000,000 |  | 5,000,000 |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 1.63 |  | $ 1.63 |  |  |  |  |  |  |  |  | $ 1.63 | $ 1.63 |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  |  |  |  | 100,000,000 |  | 75,000,000 |  |  |  |  |  |  |  |  | 100,000,000 | 75,000,000 |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Beneficial Conversion Feature Upon Issuance of Stock | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 735 |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  | 14,000 |  | 0 |  |  |  |  |  |  |  |  | 14,000 | 0 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,776 | $ 5,220 | $ 6,698 |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 7,082,000 |  | 7,067,000 |  |  |  |  |  |  |  |  | 7,082,000 | 7,067,000 |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  | 6,800 |  |  |  |  |  |  |  | $ 0 | $ 7,098 | $ 67 |  |  |  |  |  |  |
China Kington [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ladenburg Thalmann and Co. Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement, Commission Percentage |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs, Reimbursement of Expenses | $ |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs, Other | $ |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |
The 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  | $ 9,600 |  |  |  |  |  |  |  |  |  |  | $ 9,600 |  |  |  | $ 14,200 |  |  |  |  |
The July 2011 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,520 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.25 |  |  |  |  |  |  |  | $ 0.2061 | $ 1.81 | $ 5.00
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,520 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) |  |  | 35,107 | 35,107 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
March 2015 Short-term and Long-term Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 649,133 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2061 | 1.81 | $ 5.00
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 649,133 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) |  |  |  |  |  |  |  |  |  | 7,419 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  |  | 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  | $ 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 2015 Warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.00 |  |  |  |  |  |  |  |  |  |  |
March 2015 Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.25 |  |  |  |  |  |  |  |  |  |  |
March 2015 Warrants Expiring March 6, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 278,200 |  |  |  |  |  |  |  |  |  |  |
March 2015 Warrants Expiring June 6, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 370,933 |  |  |  |  |  |  |  |  |  |  |
October 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 442,802 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.00 |  |  |  |  |  |  |  |  |  | $ 0.2061 | $ 1.81 |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 442,802 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) |  | 15,320 |  |  |  |  |  | 15,320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  | 22,680 | 22,680 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  | $ 5 | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The June 2019 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,371,427 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.87 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,371,427 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Expired During Period (in shares) |  |  |  |  |  |  |  |  | 571,428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  | 571,428 | 228,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  | $ 497 | $ 199 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right Call Feature Minimum Stock Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
The June 2019 Warrants [Member] | China Kington [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Commission, Exercise of Warrants | $ |  |  |  |  |  |  |  |  | $ 29 | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of Warrants, Commission, Percent |  |  |  | 6.00% |  |  |  |  | 6.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2019 Domestic Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  | 4,198,566 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  | $ 4,900 |  |  |  | $ 3,100 |  |  |  |  |  | $ 4,900 |  |  |  |  | $ 3,100 |  |  |
Payments of Stock Issuance Costs Allocated to Warrants | $ |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  | 4,198,566 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
The 2019 Ladenburg Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  | 167,942 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.99 |  |  | $ 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  | 100 |  |  |
Payments of Stock Issuance Costs Allocated to Warrants | $ |  |  |  |  |  |  |  |  |  |  | $ 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  | 167,942 |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2019 Foreign Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |  | $ 4,200 |  |  |  |  | $ 2,000 |  |  |
Exercise of Warrants, Commission, Percent |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  | 6,898,566 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 1.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TLF Bio Innovation 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.6718 |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Conversion of Series B Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Beneficial Conversion Feature Upon Issuance of Stock | $ |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2021 Private Placement Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs Allocated to Warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |
The 2021 Private Placement Program [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 0.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Ratio | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding | 19.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Maximum Common Stock Shares Converted (in shares) | 8,984,178 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 2,672,000 |  |  | 5,836,792 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  | $ 100 |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  |  | $ 1,800 |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  |  | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | Three Accredited Investors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,371,427 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Stock and Warrants During the Period, Value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | Xiao Rui Liu [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Stock and Warrants During the Period, Value | $ |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | Hai Dong Pang [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Stock and Warrants During the Period, Value | $ |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | Ping Huang [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Stock and Warrants During the Period, Value | $ |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement [Member] | China Kington [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement, Commission Percentage |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |
August 2019 Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  | 4,198,566 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Stock and Warrants | $ |  |  |  |  |  |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Shares Issuable (in shares) | 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ | $ 14,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Purchase Price (in dollars per share) | $ / shares | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |

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