Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such Securities and Exchange Commission (“SEC”) rules and regulations and accounting principles applicable for interim periods. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Events subsequent to the balance sheet date have been evaluated for inclusion in the accompanying condensed consolidated financial statements through the date of issuance. Operating results for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for the Company’s fiscal year ending December 31, 2024. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in ThermoGenesis Holdings’ Annual Report on Form 10-K for the year ended December 31, 2023.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements include the accounts of ThermoGenesis Holdings and its wholly-owned subsidiaries, ThermoGenesis Corp. and TotipotentRX Cell Therapy, Pvt. Ltd and ThermoGenesis Corp’s majority-owned subsidiary, CARTXpress Bio, Inc. (“CARTXpress Bio”). All significant intercompany accounts and transactions have been eliminated upon consolidation. The 20% ownership interest of CARTXpress Bio that is not owned by ThermoGenesis Holdings is accounted for as a non-controlling interest as the Company has an 80% ownership interest in CARTXpress Bio. Earnings or losses attributable to other stockholders of a consolidated affiliated company are classified separately as "non-controlling interest" in the Company's consolidated statements of operations. Net loss attributable to non-controlling interests reflects only its share of the after-tax earnings or losses of an affiliated company. The Company's condensed consolidated balance sheets reflect non-controlling interests within the equity section.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency and decision usefulness of income tax disclosures. Notably, the ASU requires entities to disclose specific categories in the effective tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold, as well as disclosures of income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024 on a prospective basis. Retrospective application to each period presented in the financial statements is permitted. We are currently evaluating the impact of this standard on our consolidated financial statements. In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which requires all public entities, including those that have a single reportable segment, to provide enhanced disclosures primarily about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The new guidance is required to be applied on a retrospective basis, with all required disclosures to be made for all prior periods presented in the financial statements. The segment expense categories and amounts disclosed in prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. We are currently evaluating the impact of this standard on our consolidated financial statements. In October 2023, the FASB issued ASU 2023-06, “Disclosure Improvements—Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative.” This ASU modifies the disclosure or presentation requirements of a variety of Topics in the Codification by aligning them with the SEC’s regulations. The amendments to the various Topics should be applied prospectively, and the effective date for the Company for each amendment will be determined based on the effective date of the SEC’s removal of the related disclosure from Regulation S-X or Regulation S-K. If the SEC has not removed the applicable requirement by June 30, 2027, then the related amendment in ASU 2023-06 will be removed from the Codification and will not become effective. Early adoption of this ASU is prohibited. We are currently evaluating the new ASU to determine if it will have an impact on the disclosures or presentation in our consolidated financial statements.

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2024

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such Securities and Exchange Commission (“SEC”) rules and regulations and accounting principles applicable for interim periods. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Events subsequent to the balance sheet date have been evaluated for inclusion in the accompanying condensed consolidated financial statements through the date of issuance.

Operating results for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for the Company’s fiscal year ending December 31, 2024. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in ThermoGenesis Holdings’ Annual Report on Form 10-K for the year ended December 31, 2023.

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

The consolidated financial statements include the accounts of ThermoGenesis Holdings and its wholly-owned subsidiaries, ThermoGenesis Corp. and TotipotentRX Cell Therapy, Pvt. Ltd and ThermoGenesis Corp’s majority-owned subsidiary, CARTXpress Bio, Inc. (“CARTXpress Bio”). All significant intercompany accounts and transactions have been eliminated upon consolidation.

The 20% ownership interest of CARTXpress Bio that is not owned by ThermoGenesis Holdings is accounted for as a non-controlling interest as the Company has an 80% ownership interest in CARTXpress Bio. Earnings or losses attributable to other stockholders of a consolidated affiliated company are classified separately as "non-controlling interest" in the Company's consolidated statements of operations. Net loss attributable to non-controlling interests reflects only its share of the after-tax earnings or losses of an affiliated company. The Company's condensed consolidated balance sheets reflect non-controlling interests within the equity section.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Standards

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which is intended to enhance the transparency and decision usefulness of income tax disclosures. Notably, the ASU requires entities to disclose specific categories in the effective tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold, as well as disclosures of income taxes paid disaggregated by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024 on a prospective basis. Retrospective application to each period presented in the financial statements is permitted. We are currently evaluating the impact of this standard on our consolidated financial statements.

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” which requires all public entities, including those that have a single reportable segment, to provide enhanced disclosures primarily about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The new guidance is required to be applied on a retrospective basis, with all required disclosures to be made for all prior periods presented in the financial statements. The segment expense categories and amounts disclosed in prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. We are currently evaluating the impact of this standard on our consolidated financial statements.

In October 2023, the FASB issued ASU 2023-06, “Disclosure Improvements—Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative.” This ASU modifies the disclosure or presentation requirements of a variety of Topics in the Codification by aligning them with the SEC’s regulations. The amendments to the various Topics should be applied prospectively, and the effective date for the Company for each amendment will be determined based on the effective date of the SEC’s removal of the related disclosure from Regulation S-X or Regulation S-K. If the SEC has not removed the applicable requirement by June 30, 2027, then the related amendment in ASU 2023-06 will be removed from the Codification and will not become effective. Early adoption of this ASU is prohibited. We are currently evaluating the new ASU to determine if it will have an impact on the disclosures or presentation in our consolidated financial statements.