Note 2 - Business Combination (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended		1 Months Ended		0 Months Ended	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 01, 2014 Acquired Trusts [Member] Firstbank Corporation [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Jun. 01, 2014 Acquired Trusts [Member] Firstbank Corporation [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Jun. 30, 2014 Servicing Contracts [Member] Firstbank Corporation [Member]	Jun. 01, 2014 Servicing Contracts [Member] Firstbank Corporation [Member]	Jun. 01, 2014 Firstbank Corporation [Member]	Jun. 30, 2014 Firstbank Corporation [Member]	Jun. 30, 2014 Firstbank Corporation [Member]	Jun. 30, 2014 Firstbank Corporation [Member]	Jun. 30, 2014 Firstbank Corporation [Member]	Jun. 01, 2014 Firstbank Corporation [Member]	Jun. 01, 2014 Firstbank Corporation [Member] Estimate of Fair Value Measurement [Member]
Note 2 - Business Combination (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets											$ 1,451,483,000	$ 1,451,483,000	$ 1,451,483,000	$ 1,451,483,000	$ 1,500,000,000
Business Combination, Branches Acquired															46
Business Acquisition, Conversion of Stock Per Share (in Shares)										1
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)										8,087,272		8,087,272
Goodwill	50,870,000		50,870,000		0						50,870,000	50,870,000	50,870,000	50,870,000	50,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									7,400,000
Amortization								100,000				100,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual											4,500,000
Business Combination, Acquisition Related Costs	3,453,000	46,000	3,830,000	60,000									3,500,000	3,800,000
Business Combination, Acquired Receivables and Certain Loans, Estimated Uncollectible Cash Flows															10,400,000
Business Combination, Acquired Receivables and Certain Loans, Pre-acquisition Charge-offs															2,800,000
Business Combination, Acquired Receivables and Certain Loans, Estimated Uncollectible Interest															3,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount															926,400,000
Business Combination, Acquired Receivables, Unaccredted Discount															8,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt															$ 36,100,000	$ 21,100,000
Business Combination, Debt Assumed, Number of Trusts															4
Debt Instrument, Basis Spread on Variable Rate						1.35%	1.99%