Note 11 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - Fair Value, Nonrecurring [Member] - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Impaired loans	$ 1,458,000	$ 4,111,000
Other repossesed assets	239,000	35,000
Total assets	1,697,000	4,146,000
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Other repossesed assets	0	0
Total assets	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Other repossesed assets	0	0
Total assets	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	1,458,000	4,111,000
Other repossesed assets	239,000	35,000
Total assets	$ 1,697,000	$ 4,146,000