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Note 1 - Summary of Significant Accounting Policies (Details Textual) shares in Thousands			1 Months Ended	12 Months Ended
	Feb. 08, 2018	Sep. 15, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Number of Financial Centers				200
Number of Reportable Segments				1
FDIC Indemnification Asset, Cash Payments Received		$ 2,368,000	$ 2,368,000
Gain (Loss) on Contract Termination		$ (7,476,000)	$ (7,476,000)			$ (7,476,000)
Derivative Asset, Notional Amount				$ 303,500,000	$ 99,200,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares				0	0	0
Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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