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Note 4 - Loans Receivable and Related Allowance for Loan Losses - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Impaired loans with specific allowance, unpaid principal balance $ 147 $ 78 $ 147 $ 78 $ 76
Impaired loans with specific allowance, recorded investment 147 78 147 78 76
Related allowance 12 6 12 6 5
Impaired loans with specific allowance, average recorded investment 208 109 164 100 77
Impaired loans with specific allowance, interest income recognized in period 1 1 3 2 3
Impaired loans with specific allowance, cash basis interest recognized in period 1 1 3 2 3
Impaired loans with no specific allowance, unpaid principal balance 2,259 3,094 2,259 3,094 519
Impaired loans with no specific allowance, recorded investment 2,148 3,019 2,148 3,019 407
Impaired loans with no specific allowance, average recorded investment 1,768 1,699 1,314 1,262 1,399
Impaired loans with no specific allowance, interest income recognized in period 44 58 59 61 99
Impaired loans with no specific allowance, cash basis interest recognized in period 26 1 40 4 41
Residential Portfolio Segment [Member]          
Impaired loans with specific allowance, unpaid principal balance 71 73 71 73 72
Impaired loans with specific allowance, recorded investment 71 73 71 73 72
Related allowance 1 6 1 6 5
Impaired loans with specific allowance, average recorded investment 71 73 71 73 72
Impaired loans with specific allowance, interest income recognized in period 1 1 2 2 3
Impaired loans with specific allowance, cash basis interest recognized in period 1 1 2 2 3
Impaired loans with no specific allowance, unpaid principal balance 384 378 384 378 398
Impaired loans with no specific allowance, recorded investment 273 303 273 303 286
Impaired loans with no specific allowance, average recorded investment 276 305 279 308 301
Impaired loans with no specific allowance, interest income recognized in period 1 1 4
Impaired loans with no specific allowance, cash basis interest recognized in period 1 1 4
Home Equity Loans and Lines of Credit [Member]          
Impaired loans with specific allowance, unpaid principal balance 4 5 4 5 4
Impaired loans with specific allowance, recorded investment 4 5 4 5 4
Related allowance
Impaired loans with specific allowance, average recorded investment 4 5 4 6 5
Impaired loans with specific allowance, interest income recognized in period
Impaired loans with specific allowance, cash basis interest recognized in period
Impaired loans with no specific allowance, unpaid principal balance
Impaired loans with no specific allowance, recorded investment
Impaired loans with no specific allowance, average recorded investment
Impaired loans with no specific allowance, interest income recognized in period
Impaired loans with no specific allowance, cash basis interest recognized in period
Commercial Real Estate Portfolio Segment [Member]          
Impaired loans with specific allowance, unpaid principal balance
Impaired loans with specific allowance, recorded investment
Related allowance
Impaired loans with specific allowance, average recorded investment 75 50
Impaired loans with specific allowance, interest income recognized in period
Impaired loans with specific allowance, cash basis interest recognized in period
Impaired loans with no specific allowance, unpaid principal balance 1,734 2,478 1,734 2,478 81
Impaired loans with no specific allowance, recorded investment 1,734 2,478 1,734 2,478 81
Impaired loans with no specific allowance, average recorded investment 1,400 1,255 960 848 1,019
Impaired loans with no specific allowance, interest income recognized in period 40 52 54 53 88
Impaired loans with no specific allowance, cash basis interest recognized in period 24 37 1 35
Commercial Portfolio Segment [Member]          
Impaired loans with specific allowance, unpaid principal balance 72 72
Impaired loans with specific allowance, recorded investment 72 72
Related allowance 11 11
Impaired loans with specific allowance, average recorded investment 58 31 39 21
Impaired loans with specific allowance, interest income recognized in period 1
Impaired loans with specific allowance, cash basis interest recognized in period 1
Impaired loans with no specific allowance, unpaid principal balance 141 238 141 238 40
Impaired loans with no specific allowance, recorded investment 141 238 141 238 40
Impaired loans with no specific allowance, average recorded investment 92 139 75 106 79
Impaired loans with no specific allowance, interest income recognized in period 4 6 4 7 7
Impaired loans with no specific allowance, cash basis interest recognized in period 2 1 2 2 2
Consumer Portfolio Segment [Member]          
Impaired loans with specific allowance, unpaid principal balance
Impaired loans with specific allowance, recorded investment
Related allowance
Impaired loans with specific allowance, average recorded investment
Impaired loans with specific allowance, interest income recognized in period
Impaired loans with specific allowance, cash basis interest recognized in period
Impaired loans with no specific allowance, unpaid principal balance
Impaired loans with no specific allowance, recorded investment
Impaired loans with no specific allowance, average recorded investment
Impaired loans with no specific allowance, interest income recognized in period
Impaired loans with no specific allowance, cash basis interest recognized in period