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Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale, continuous unrealized loss position, less than 12 months $ 5,381,000 $ 32,243,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 21,000 395,000
Securities available for sale, continuous unrealized loss position, 12 months or more 1,293,000 85,330,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 4,000 859,000
Securities available for sale, continuous unrealized loss position 6,674,000 117,573,000
Securities available for sale, continuous unrealized loss position, unrealized loss 25,000 1,254,000
US Government Agencies Debt Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 25,650,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 349,000
Securities available for sale, continuous unrealized loss position, 12 months or more 0 73,913,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 0 793,000
Securities available for sale, continuous unrealized loss position 0 99,563,000
Securities available for sale, continuous unrealized loss position, unrealized loss 0 1,142,000
Collateralized Mortgage Backed Securities [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 1,487,000 2,838,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 2,000 28,000
Securities available for sale, continuous unrealized loss position, 12 months or more 26,000 10,423,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,000 54,000
Securities available for sale, continuous unrealized loss position 1,513,000 13,261,000
Securities available for sale, continuous unrealized loss position, unrealized loss 3,000 82,000
Municipal General Obligation Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 3,894,000 3,755,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 19,000 18,000
Securities available for sale, continuous unrealized loss position, 12 months or more 713,000 994,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 2,000 12,000
Securities available for sale, continuous unrealized loss position 4,607,000 4,749,000
Securities available for sale, continuous unrealized loss position, unrealized loss 21,000 30,000
Municipal Revenue Bonds [Member]    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position, 12 months or more 554,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,000 0
Securities available for sale, continuous unrealized loss position 554,000 0
Securities available for sale, continuous unrealized loss position, unrealized loss $ 1,000 $ 0