v3.21.2

Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($) |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 08, 2021 | Feb. 04, 2021 | Jan. 28, 2021 | Sep. 30, 2021 | Nov. 09, 2021 | Nov. 04, 2021
Subsequent Event [Member] |  |  |  |  |  |
Equity Offering Sales Agreement, Aggregate Sales Price Value |  |  |  |  | $ 50,000,000.0 |
Common Stock [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 2,530,000 |  |
The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member] |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Net | $ 27,600,000 |  |  |  |  |
The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member] | Common Stock [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 2,530,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  | $ 750,000 | $ 1,500,000 |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 5.00% |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  |  |  |  | $ 3,000,000

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