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Note 10 - Subordinated Debt - Related Parties (Details Textual) - John H Schwan [Member] - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2017
Exchange of Debt To Common Stock [Member] |  |  |
Debt Conversion, Original Debt, Amount | $ 0.6 |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 181,000 |  |
Share Price (in dollars per share) | $ 3.32 |  |
Long-term Debt, Total |  | $ 1.1 |
Promissory Note [Member] |  |  |
Due to Related Parties, Total |  |  | $ 1.1
Interest Payable |  |  | $ 0.4

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