Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Property, Plant, and Equipment, Useful Lives [Table Text Block]

Buildings and improvements (years)	35	-	40
Furniture and fixtures and vehicles (years)	3	-	10

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

											To Be Well Capitalized
						For Capital					Under Prompt Corrective
	Actual					Adequacy Purposes					Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2017
Tier 1 (core) capital, and ratio to adjusted total assets Bank	$	89,526		11.5	%	$	31,227		4.0	%	$	39,034		5.0	%
Tier 1 (core) capital, and ratio to risk-weighted assets Bank	$	89,526		12.5	%	$	42,939		6.0	%	$	57,252		8.0	%
Total risk-based capital, and ratio to risk-weighted assets Bank	$	96,633		13.5	%	$	57,252		8.0	%	$	71,565		10.0	%
Common equity tier 1 capital ratio to risk-weighted assets Bank	$	89,526		12.5	%	$	32,204		4.5	%	$	46,517		6.5	%

											To Be Well Capitalized
						For Capital					Under Prompt Corrective
	Actual					Adequacy Purposes					Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
As of December 31, 2016
Tier 1 (core) capital, and ratio to adjusted total assets Bank	$	85,255		12.5	%	$	27,283		4.0	%	$	34,103		5.0	%
Tier 1 (core) capital, and ratio to risk-weighted assets Bank	$	85,255		14.0	%	$	36,434		6.0	%	$	48,578		8.0	%
Total risk-based capital, and ratio to risk-weighted assets Bank	$	90,997		15.0	%	$	48,578		8.0	%	$	60,723		10.0	%
Common equity tier 1 capital ratio to risk-weighted assets Bank	$	85,255		14.0	%	$	27,325		4.5	%	$	39,470		6.5	%

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended		Year Ended		Year Ended
	December 31, 2017		December 31, 2016		December 31, 2015
Net income available to common shareholders	$	5,157,664	$	5,594,011	$	5,716,767
Weighted average common shares outstanding		4,372,262		4,363,949		4,333,418
Effect of dilutive securities		68,685		56,299		55,931
Weighted average diluted shares outstanding		4,440,947		4,420,248		4,389,349
Basic income per common share	$	1.18	$	1.28	$	1.32
Diluted income per common share	$	1.16	$	1.27	$	1.30