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Note 3 - Business Combinations (Details Textual)
3 Months Ended 6 Months Ended
May 10, 2018
USD ($)
Feb. 06, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Assets, Total     $ 930,235,000 $ 930,235,000   $ 852,080,000
Marketable Securities, Total     28,432,000 28,432,000   30,026,000
Deposits, Total     712,312,000 712,312,000   637,439,000
Goodwill, Ending Balance     2,100,000 2,100,000  
Debt Securities, Available-for-sale, Realized Gain (Loss), Total         $ (78,000)  
Securities Acquired in Business Acquisition [Member]            
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ 0          
Prime Bank [Member]            
Business Combination, Acquisition Related Costs       $ 383,000    
Goodwill, Ending Balance 2,100,000          
Business Combination, Initial Cash Purchase Price 5,890,000          
Business Combination, Final Estimated Purchase Price 1,000,000          
Business Combination, Contingent Consideration, Liability, Total 1,761,000          
Payments to Acquire Businesses, Gross 5,596,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total $ 56,095,000          
Prime Bank [Member] | Core Deposits [Member]            
Finite-Lived Intangible Asset, Useful Life 10 years          
Prime Bank [Member] | Securities Acquired in Business Acquisition [Member]            
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ 0          
Prime Bank [Member] | Measurement Input, Account Balance Growth Rate [Member]            
Core Deposit, Measurement Input 0.03          
Hana SBL [Member]            
Business Combination, Acquisition Related Costs     $ 313,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans and Servicing Rights   $ 120,000,000        
Business Combination, Servicing Rights Purchased, Loan Amount   370,000,000        
Payments to Acquire Businesses, Gross   83,000,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total   41,000,000        
Prime Bank [Member]            
Assets, Total $ 65,000,000          
Marketable Securities, Total 36,000,000          
Loans Payable, Total 23,000,000          
Deposits, Total $ 46,000,000          
Hana SBL [Member]            
SBA 7 (a) Loan Amount Originated   $ 1,000,000,000