Note 2 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Selling Costs, Percentage			10.00%
Impaired Financing Receivable, Related Allowance	$ 34		$ 34		$ 98
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		0
Other Real Estate, Ending Balance	0		0		228
Other Real Estate, Gross					2,217
Real Estate Owned, Valuation Allowance, Ending Balance					1,989
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount			0	$ 0
Collateral Dependent Loans [Member]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,503		1,503		362
Impaired Financing Receivable, Related Allowance	34		34		98
Financing Receivable, Credit Loss, Expense (Reversal)	3	$ 0	1	0	4
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 65	$ 0	$ 65	$ 0	$ 0