Note 18 - Stock-based Compensation (Details Textual)				1 Months Ended	12 Months Ended
	Dec. 06, 2017 $ / shares shares	Dec. 06, 2016 $ / shares	Oct. 11, 2016	Oct. 31, 2016	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Nov. 17, 2017 shares
Allocated Share-based Compensation Expense | $					$ 25,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					178,650	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares					$ 14.90	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 3.66
Stockholders' Equity Note, Stock Split, Conversion Ratio			2.0473	2.0473
Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							263,127
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	178,650
Stock Issued During Period, Shares, Restricted Stock Award, Gross	74,750
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 14.90
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					7 years
Incentive Plan [Member] | Employee Stock Option [Member]
Common Stock, Capital Shares Reserved for Future Issuance							187,948
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $					$ 581,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					5 years
Incentive Plan [Member] | Restricted Stock [Member]
Common Stock, Capital Shares Reserved for Future Issuance							75,179
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $					$ 1,002,000
Prior Plan [Member]
Allocated Share-based Compensation Expense | $					$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					0
Stock-based Compensation Expense [Member]
Allocated Share-based Compensation Expense | $					$ 16,000
Stock-based Other Noninterest Expense [Member]
Allocated Share-based Compensation Expense | $					$ 9,000