Note 10 - Employment Benefit and Retirement Plans (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Oct. 11, 2016 USD ($) $ / shares shares	May 06, 2005 USD ($) $ / shares shares
Loan to Employee Stock Ownership Plan			$ 1,907,160	$ 763,140
Employee Stock Ownership Plan (ESOP), Shares in ESOP | shares	259,640	57,817	190,716	76,314
Sale of Stock, Price Per Share | $ / shares			$ 10	$ 10
Employee Stock Ownership Plan ESOP Interest and Principal Payments from ESOP	$ 239,000
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares | shares	18,779	5,087
Fair Value Per Share | $ / shares	$ 10.86	$ 10.85
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 195,949	$ 55,187
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares | shares	85,493	55,964
Fair Value Inputs, Discount Rate	4.50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Safe Harbor Contributions, Percent	3.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 146,920	$ 122,456
Deferred Compensation Liability, Current and Noncurrent	$ 1,361,190	1,236,857
Pension Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 years
Supplemental Executive Retirement Plan [Member]
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ 501,852	433,069
Pension and Other Postretirement Benefit Expense	86,365	73,292
Deferred Compensation Agreements with Certain Directors [Member]
Defined Benefit Plan, Contributions by Employer	85,882	93,689
Director Retirement Plan [Member]
Defined Benefit Plan, Contributions by Employer	$ 31,000	$ 31,000
Defined Benefit Plan, Number of Participants	6	6
Defined Benefit Plan, Guaranteed Payment Term	10 years
Director Retirement Plan [Member] | Other Liabilities [Member]
Defined Benefit Pension Plan, Liabilities	$ 315,503	$ 334,103
Director Retirement Plan [Member] | Active Employees Not Yet Eligible [Member]
Defined Benefit Plan, Number of Participants	2	2
Mezzanine Capital [Member]
Fair Value Per Share | $ / shares	$ 12.73	$ 10.05
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares | shares	63,443	37,467