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Note 2 - Revised Prior Period Financial Statements - Revised Financial Statements (Details) (Parentheticals) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accounts Receivable, Allowance for Credit Loss, Current | $ 45,000 | $ 64,000 | $ 71,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 | $ 0.01 |
Common Stock, Shares Authorized (in shares) | 50,000,000 | 50,000,000 |
Common Stock, Shares, Outstanding, Ending Balance (in shares) | 12,226,306 | 13,115,341 |

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