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Note 10 - Subordinated Debt - Related Parties (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Jan. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jan. 11, 2019	Dec. 31, 2017
Share Price (in dollars per share)				$ 3.32
John H Schwan [Member] \| 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	$ 1.1
John H Schwan [Member] \| Promissory Note [Member]
Due to Related Parties, Total					$ 1.1
Interest Payable					$ 0.4