Note 10 - Derivatives - Fair Value of Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount	$ 48,500,000	$ 25,400,000
Derivative, fair value	226,980	167,267
Gain On Sale of Loans [Member]
Gain on sale of loans	139,435	208,893
Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount	21,500,000	13,500,000
Derivative, fair value	(153,906)	(15,820)
Forward Contracts [Member] | Gain On Sale of Loans [Member]
Gain on sale of loans	(58,344)	25,806
Interest Rate Lock Commitments [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative, notional amount	27,000,000	11,900,000
Derivative, fair value	380,886	183,087
Interest Rate Lock Commitments [Member] | Gain On Sale of Loans [Member]
Gain on sale of loans	$ 197,779	$ 183,087