Note 2 - Securities (Details Textual)		12 Months Ended
	Oct. 01, 2018 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Equity Securities, FV-NI		$ 7,000	$ 1,817,000
Equity Securities, FV-NI, Realized Loss		10,000
Equity Securities Sold, Amount		1,300,000
Equity Securities, FV-NI, Realized Gain (Loss), Total		(43,000)
Debt Securities, Available-for-sale, Restricted		$ 20,600,000	21,800,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total			$ 508,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		112
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		80
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total		$ 0
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		45
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		25
Collateralized Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		18
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		12
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		7
US Treasury and Government [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		5
Community First [Member]
Equity Securities, FV-NI, Realized Gain (Loss), Total	$ 690,000
Investment Owned, Balance, Shares | shares	18,000