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Note 11 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
   
2020
   
2019
 
   
Remaining Contractual Maturity of the
Agreements
 
   
Overnight
   
Overnight
 
                 
                 
Securities sold under agreements to repurchase:
               
U.S. government treasuries
  $
3,629
    $
3,528
 
U.S. government agencies
   
42,239
     
35,557
 
U.S. government mortgage-backed securities
   
20,763
     
19,614
 
                 
Total pledged collateral
  $
66,631
    $
58,699