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Note 10 - Subordinated Debt - Related Parties	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Subordinated Borrowings Disclosure [Text Block]	10.    Subordinated Debt – Related Parties As of December 2017, Mr. Schwan was owed a total of $1.1 million, with additional accrued interest of $0.4 million, by the Company. As part of the December 2017 financing with PNC, Mr. Schwan executed a subordination agreement related to these amounts due him, as evidenced by a related note representing the amount owed to Mr. Schwan. During January 2019, Mr. Schwan and the Company agreed to an exchange of $0.6 million of his debt for approximately 181,000 shares of CTI common stock at the then market rate of $3.32 per share. As of December 31, 2020 and 2019, the balance of Mr. Schwan's note was approximately $1.1 million and $1.1 million, respectively, including accrued interest.

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- References

No definition available.

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- Definition

The entire disclosure for borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC's uniform net capital rule, including restrictive covenants, collateral, interest rates and due dates, amounts due by date and amount owed in total.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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