Note 2 - Summary of Significant Accounting Policies - Change in Other Real Estate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 1,170,000	$ 1,344,000
Additions		656,000
Dispositions	(423,000)	(675,000)
Write-downs	(40,000)	(155,000)
Balance	$ 707,000	$ 1,170,000