Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Other Tax Expense (Benefit)	$ 2,300,000	$ 2,300,000
Unrecognized Tax Benefits, Ending Balance	0	0
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender	646,000	646,000
Operating Loss Carryforwards, Total	400,000	$ 600,000
Deferred Tax Assets, Valuation Allowance, Total	0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Maximum Usable Amount Per Year	$ 200,000