Note 5 - Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense	$ 348,467	$ 334,977	$ 339,839
General Contractor [Member] | Estimated Full Contract Price to Complete Remodel [Member]
Related Party Transaction, Amounts of Transaction		3,700,000
Due to Related Parties		$ 2,200,000