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Note 5 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 17, 2020 | Jun. 05, 2020 | Apr. 13, 2020 | Apr. 01, 2020 | Feb. 21, 2020 | Jan. 30, 2020 | Jan. 13, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Feb. 24, 2020 | Jun. 08, 2018 | Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00% |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 479,802 | 479,802 |  | 479,802 | 479,802 |  | 471,144 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  |  |  |  | 332,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |
Common Stock Dividends, Shares (in shares) |  |  |  |  |  |  |  |  | 18,007 |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Advance from Investor, Current |  |  |  |  |  |  |  | 1,500,000 | $ 1,500,000 |  | $ 1,500,000 | $ 1,500,000 |  |  |  |  |
Former President [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |  |  |  |
LF International [Member] | Yunhong CTI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 57.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Convertible Preferred Shares into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  |  |  | 42,660 |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  | 426,600 |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Redemption Premium |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Total |  |  |  |  |  |  |  |  |  |  |  | $ 255,341 |  |  |  |  |
Series A Preferred Stock [Member] | Conversion to an Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  | $ 482,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  | 48,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  |  |  |  |  | $ 478,000 |  |  |  |  |  |
Purchase Agreement [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  | 48,200 |  |  |  |  |  |
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  | 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 10 | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 500,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  | 260,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Offering Amount |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] | Conversion from Each Share Series A Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Shares Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Closing of the Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Shares Agreed to Purchase (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000 |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  |  | $ 220,600 | $ 206,000 |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Contingent Additional Offered Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140,000 |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 22,060 | 20,600 |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Offering Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |
Second Closing of the Offering [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Incentive Plan 2009 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510,000
Stock Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 20,000 | 20,000 |  | 20,000 | 20,000 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | $ 0 | $ 20,000 |  | $ 0 | $ 72,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 0.42% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  |  |  |  |  |  | 153.73% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 1.65% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  |  |  |  |  |  | 161.48% |  |  |  |  |

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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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