Note 2 - Acquisition of Community State Bank and Common Stock Offering - Consideration Paid and Goodwill (Details) - USD ($)	Aug. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consideration paid:
Goodwill		$ 13,110,913	$ 3,222,688	$ 3,222,688
Community State Bank [Member]
Cash and due from banks *	$ 10,094,645
Federal funds sold	698,000
Interest-bearing deposits at financial institutions	14,730,157
Securities	102,640,029
Loans/leases receivable, net	419,029,277
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	20,684,880
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	6,352,653
Restricted investment securities	1,512,900
Other real estate owned	650,000
Other assets	5,283,937
Total assets acquired	581,676,478
Deposits	486,298,262
FHLB advances	20,368,877
Other liabilities	4,897,564
Total liabilities assumed	511,564,703
Net assets acquired	70,111,775
Consideration paid:
Payments to Acquire Businesses, Gross	80,000,000
Total consideration paid	80,000,000
Goodwill	$ 9,888,225