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Note 16 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 04, 2023 | Oct. 02, 2020 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Issuance of common stock upon exercise of stock options, net (in shares) |  |  | 0 | 20,000 |  |  |
Issuance of common stock upon vesting of restricted stock units (in shares) |  |  | 10,000 | 12,667 |  |  |
Gross Proceeds from Stock Options Exercised |  |  | $ 0 | $ 32,000 |  |  |
Underwritten Public Offering, Common Stock | 5,750,000 |  |  |  |  |  |
Price Per Share, Underwritten Agreement | $ 2 |  |  |  |  |  |
Gross Proceeds From Underwritten Public Offering, Common Stock | $ 11,500,000 |  |  |  |  |  |
Payments of Stock Issuance Costs | $ 1,051,000 |  |  |  |  |  |
Share Price |  |  | $ 2.03 |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 1,924,000 |  |  |  |
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock |  |  | $ 527,000 |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0 | $ 0 |  |  |
Share Buyback Program [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 5,000,000,000 |  |  |
Stock Repurchased and Retired During Period, Shares (in shares) |  |  | 0 | 0 |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 1,924,000 |  |  |  |
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock |  |  | $ 527,000 |  |  |  |
Evertel Technologies, LLC [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 986,486 |  |  |  |  |  |
Share Price | $ 1.95 |  |  |  |  |  |
Evertel Technologies, LLC [Member] | Agreement to Issue Stock [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 270,270 |  |  |  |  |  |
Share Price | $ 1.95 |  |  |  |  |  |
Evertel Technologies, LLC [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 1,924 |  |  |  |  |  |
Evertel Technologies, LLC [Member] | Additional Paid-in Capital [Member] | Agreement to Issue Stock [Member] |  |  |  |  |  |  |
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock | $ 527,000 |  |  |  |  |  |
Assets Acquisition of Amika Mobile Corporation [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 573,801 | 69,564 |  | 69,564 |  |
Share Price |  | $ 5.98 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Each Anniversaries |  | 191,267 |  |  |  |  |
Business Acquisition, Share Price |  | $ 5.98 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 3,431,000 |  |  |  |  |
Assets Acquisition of Amika Mobile Corporation [Member] | Former Owner of Amika Mobile [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  | 69,564 |  | 69,564 | 69,564 | 365,109

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