Note 21 - Fair Value of Financial Instruments - Financial Instruments (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Cash and due from banks	$ 22,854,712	$ 19,425,747
Interest-bearing deposits in other banks	23,320,968	18,565,521
Available-for-sale Securities	192,606,119	248,294,725
Securities held to maturity, fair value	511,000	510,000
Securities held to maturity	509,617	508,456
Loans and leases HFI, net, less impaired loans	691,969,119	599,147,724
Stock in FHLB of Atlanta	1,573,700	2,369,300
Accrued interest receivable	3,525,684	2,874,506
Bank-owned life insurance	18,080,183	15,635,140
Impaired loans HFI, net	11,123,000	15,820,000
Servicing Asset at Fair Value, Amount	3,128,000	2,301,000
Deposits	870,600,363	811,322,227
Fair Value, Inputs, Level 1 [Member]
Interest-bearing deposits in other banks	23,321,000	18,566,000
Available-for-sale Securities	16,995,000	31,385,000
Fair Value, Inputs, Level 2 [Member]
Available-for-sale Securities	175,611,000	216,910,000
Securities held to maturity, fair value	511,000	510,000
Securities held to maturity	510,000	508,000
Loans held for sale	5,099,000	3,944,000
Loans and leases HFI, net, less impaired loans, fair value	678,911,000	586,494,000
Loans and leases HFI, net, less impaired loans	681,239,000	583,946,000
Stock in FHLB of Atlanta, fair value	1,574,000	2,369,000
Stock in FHLB of Atlanta	1,574,000	2,369,000
Accrued interest receivable	3,526,000	2,875,000
Bank-owned life insurance	18,080,000	15,635,000
Deposits	869,591,000	811,089,000
Deposits, fair vlalue	870,600,000	811,322,000
Junior subordinated debentures	10,310,000	10,310,000
Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Interest rate swap	121,000	(394,000)
Fair Value, Inputs, Level 3 [Member]
Servicing Asset at Fair Value, Amount	3,128,000	2,301,000
Mortgage servicing rights	2,149,000	1,266,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	22,855,000	19,426,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans HFI, net	10,730,000	15,202,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	22,855,000	19,426,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans HFI, net	$ 10,730,000	$ 15,202,000