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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Gain on equity securities [1] $ 58,000 $ 18,000
Earnings on bank-owned life insurance [1] 105,000 112,000
Gain on sale of loans [1] 37,000 4,000
Total noninterest income 1,110,000 786,000
Overdraft Fees [Member]    
Noninterest income revenue 248,000 193,000
ATM Banking Fees [Member]    
Noninterest income revenue 194,000 201,000
Service Charge and Other Fees [Member]    
Noninterest income revenue 66,000 59,000
Financial Service, Other [Member]    
Noninterest income revenue $ 402,000 $ 199,000
[1] Not within scope of ASC 606