Note 2 - Acquisition of Community State Bank and Common Stock Offering - Changes in Accretable Yield (Details) - Community State Bank [Member]	12 Months Ended
	Dec. 31, 2016 USD ($)
Balance at the beginning of the period
Discount added at acquisition	(12,193,588)
Accretion recognized	2,883,668
Balance at the end of the period	(9,309,920)
Performing Financial Instruments [Member]
Balance at the beginning of the period
Discount added at acquisition	(11,916,009)
Accretion recognized	2,800,395
Balance at the end of the period	(9,115,614)
Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at the beginning of the period
Discount added at acquisition	(277,579)
Accretion recognized	83,273
Balance at the end of the period	$ (194,306)