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Note 10 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Off-Balance Sheet, Credit Loss, Liability, Ending Balance $ 6,000,000 $ 3,850,000 $ 350,000 $ 3,900,000
Performance Guarantee [Member]        
Deferred Tax Assets, Reserves and Accruals Provision for Off-balance Sheet Exposures       $ 2,600,000
Guarantee Obligation, Estimated Payment Under Default on Contract $ 2,200,000      
Standby Letters of Credit [Member] | Minimum [Member]        
Guarantee Obligations, Agreement Term (Year) 1 year      
Standby Letters of Credit [Member] | Maximum [Member]        
Guarantee Obligations, Agreement Term (Year) 2 years      
Other Liabilities [Member]        
Off-Balance Sheet, Credit Loss, Liability, Ending Balance $ 6,000,000   $ 350,000