Note 9 - Acquisition of Community State Bank and Common Stock Offering - Consideration Paid and Goodwill (Details) - USD ($)	Aug. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
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 held for investment, 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	4,763,224
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	581,155,765
Deposits	486,298,262
FHLB advances	20,368,877
Other liabilities	4,897,564
Total liabilities assumed	511,564,703
Net assets acquired	69,591,062
Consideration paid:
Cash paid *	80,000,000
Business Combination, Consideration Transferred	80,000,000
Goodwill	$ 10,408,938
Goodwill		$ 13,631,626	$ 3,222,688	$ 3,222,688