Note 14 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deferred directors' fees	$ 163,900	$ 174,370
Allowance for credit losses	2,918,535	2,823,230
Employee benefits	317,623	295,387
Unrealized loss on interest rate swap		146,940
Alternative minimum tax credits	508,774	347,860
Other	492,698	268,145
Net operating loss carryovers	2,346,457	4,873,610
Gross deferred tax asset	6,747,987	8,929,542
Valuation allowance	(78,110)	(84,650)
Total deferred tax asset	6,669,877	8,844,892
Deferred income tax liabilities:
Depreciation and amortization	608,528	387,564
Carrying value – land	359,800	366,400
Mortgage servicing rights	688,750	400,151
Deferred loan origination fees and costs	738,526	547,745
Unrealized gain on securities available for sale	805,542	1,651,712
Unrealized gain on interest rate swap	43,514
Loan mark-to-market	23,230	28,411
Total deferred tax liability	3,267,890	3,381,983
Net deferred income tax asset	$ 3,401,987	$ 5,462,909