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Note 15 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2018 | Jun. 30, 2022 | May 31, 2021
Warrants and Rights Outstanding, Term (Year) |  | 5 years |
Taglich Brothers Inc. [Member] |  |  |
Related Party Transaction, Success Fee, Revenue Target Over 200 Million | $ 1 |  |
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 82,945
Taglich Brothers Inc. [Member] | Warrants Associated with the February and May 2021 Offerings [Member] | Weighted Average [Member] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 3.21
Warrants and Rights Outstanding, Term (Year) |  |  | 5 years

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- Definition The amount of success fee to be paid to the related party for the acquisition target over $20 million. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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