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Note 4 - Loans - Impaired Loans (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Unpaid Contractual Principal Balance $ 9,783,024 $ 10,087,137
Recorded Investment With No Allowance 8,877,787 9,188,535
Recorded Investment With Allowance
Total Recorded Investment 8,877,787 9,188,535
Related Allowance
Average Recorded Investment 9,033,161 5,661,790
Interest Recognized 66,351 386,104
Commercial Real Estate Portfolio Segment [Member]    
Unpaid Contractual Principal Balance 7,140,572 7,246,478
Recorded Investment With No Allowance 6,689,472 6,811,698
Recorded Investment With Allowance
Total Recorded Investment 6,689,472 6,811,698
Related Allowance
Average Recorded Investment 6,750,585 4,448,343
Interest Recognized 34,931 352,938
Construction and Land Development [Member]    
Unpaid Contractual Principal Balance 1,709,030 1,719,010
Recorded Investment With No Allowance 1,554,070 1,566,174
Recorded Investment With Allowance
Total Recorded Investment 1,554,070 1,566,174
Related Allowance
Average Recorded Investment 1,560,122 783,087
Interest Recognized 22,477 22,520
Residential Portfolio Segment [Member]    
Unpaid Contractual Principal Balance 933,422 1,121,649
Recorded Investment With No Allowance 634,245 810,663
Recorded Investment With Allowance
Total Recorded Investment 634,245 810,663
Related Allowance
Average Recorded Investment 722,454 430,360
Interest Recognized $ 8,943 $ 10,646