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Note 6 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Loans receivable $ 1,295 $ 535
Other real estate owned 621 4,004
Total 1,916 4,539
Fair Value, Inputs, Level 1 [Member]    
Loans receivable 0 0
Other real estate owned 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member]    
Loans receivable 0 0
Other real estate owned 0 0
Total 0 0
Fair Value, Inputs, Level 3 [Member]    
Loans receivable 1,295 535
Other real estate owned 621 4,004
Total $ 1,916 $ 4,539