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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and Balance in the Loan Portfolio (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Beginning balance $ 7,740,000 $ 4,790,000 $ 7,593,000 $ 4,057,000  
Charge-offs (100,000) (119,000) (293,000) (208,000)  
Recoveries 144,000 79,000 234,000 126,000  
Provision 166,000 1,000,000 416,000 1,775,000  
Ending balance 7,950,000 5,750,000 7,950,000 5,750,000  
Individually evaluated for impairment 362,000 497,000 362,000 497,000 $ 431,000
Collectively evaluated for impairment 7,588,000 5,253,000 7,588,000 5,253,000 7,162,000
Individually evaluated for impairment 6,824,000 5,296,000 6,824,000 5,296,000 7,851,000
Collectively evaluated for impairment 978,487,000 897,529,000 978,487,000 897,529,000 1,039,745,000
Acquired with deteriorated credit quality 19,276,000 5,168,000 19,276,000 5,168,000 22,072,000
Loans 1,004,587,000 907,993,000 1,004,587,000 907,993,000 1,069,668,000
Agricultural [Member]          
Beginning balance 342,000 347,000 257,000 471,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 32,000 (95,000) 117,000 (219,000)  
Ending balance 374,000 252,000 374,000 252,000  
Individually evaluated for impairment 138,000 0 138,000 0 0
Collectively evaluated for impairment 236,000 252,000 236,000 252,000 257,000
Individually evaluated for impairment 3,167,000 379,000 3,167,000 379,000 348,000
Collectively evaluated for impairment 43,400,000 50,556,000 43,400,000 50,556,000 53,387,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 46,567,000 50,935,000 46,567,000 50,935,000 53,735,000
Commercial and Industrial [Member]          
Beginning balance 1,599,000 853,000 1,327,000 655,000  
Charge-offs (24,000) (17,000) (98,000) (17,000)  
Recoveries 64,000 0 73,000 1,000  
Provision (116,000) 562,000 221,000 759,000  
Ending balance 1,523,000 1,398,000 1,523,000 1,398,000  
Individually evaluated for impairment 20,000 31,000 20,000 31,000 19,000
Collectively evaluated for impairment 1,503,000 1,367,000 1,503,000 1,367,000 1,308,000
Individually evaluated for impairment 184,000 321,000 184,000 321,000 1,663,000
Collectively evaluated for impairment 259,034,000 237,852,000 259,034,000 237,852,000 295,154,000
Acquired with deteriorated credit quality 5,814,000 3,839,000 5,814,000 3,839,000 6,710,000
Loans 265,032,000 242,012,000 265,032,000 242,012,000 303,527,000
Consumer Portfolio Segment [Member]          
Beginning balance 247,000 220,000 317,000 270,000  
Charge-offs (76,000) (95,000) (147,000) (184,000)  
Recoveries 35,000 66,000 113,000 110,000  
Provision 37,000 52,000 (40,000) 47,000  
Ending balance 243,000 243,000 243,000 243,000  
Individually evaluated for impairment 0 6,000 0 6,000 1,000
Collectively evaluated for impairment 243,000 236,000 243,000 236,000 316,000
Individually evaluated for impairment 0 24,000 0 24,000 8,000
Collectively evaluated for impairment 33,354,000 33,745,000 33,354,000 33,745,000 33,982,000
Acquired with deteriorated credit quality 16,000 0 16,000 0 24,000
Loans 33,370,000 33,769,000 33,370,000 33,769,000 34,014,000
Commercial Real Estate Portfolio Segment [Member]          
Beginning balance 4,345,000 1,960,000 4,178,000 1,663,000  
Charge-offs 0 0 (48,000) 0  
Recoveries 42,000 0 43,000 0  
Provision (10,000) 873,000 204,000 1,170,000  
Ending balance 4,377,000 2,833,000 4,377,000 2,833,000  
Individually evaluated for impairment 56,000 235,000 56,000 235,000 157,000
Collectively evaluated for impairment 4,321,000 2,599,000 4,321,000 2,599,000 4,021,000
Individually evaluated for impairment 1,140,000 2,246,000 1,140,000 2,246,000 3,032,000
Collectively evaluated for impairment 461,941,000 359,696,000 461,941,000 359,696,000 453,681,000
Acquired with deteriorated credit quality 10,906,000 1,121,000 10,906,000 1,121,000 12,534,000
Loans 473,987,000 363,063,000 473,987,000 363,063,000 469,247,000
Construction Real Estate [Member]          
Beginning balance 74,000 124,000 97,000 76,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 0 (45,000) (23,000) 3,000  
Ending balance 74,000 79,000 74,000 79,000  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 74,000 79,000 74,000 79,000 97,000
Individually evaluated for impairment 0 0 0 0 80,000
Collectively evaluated for impairment 15,440,000 15,576,000 15,440,000 15,576,000 16,559,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 15,440,000 15,576,000 15,440,000 15,576,000 16,639,000
Residential Portfolio Segment [Member]          
Beginning balance 1,024,000 1,061,000 1,300,000 640,000  
Charge-offs 0 (7,000) 0 (7,000)  
Recoveries 3,000 13,000 5,000 15,000  
Provision (167,000) (122,000) (445,000) 297,000  
Ending balance 860,000 945,000 860,000 945,000  
Individually evaluated for impairment 148,000 225,000 148,000 225,000 254,000
Collectively evaluated for impairment 712,000 720,000 712,000 720,000 1,046,000
Individually evaluated for impairment 2,333,000 2,326,000 2,333,000 2,326,000 2,720,000
Collectively evaluated for impairment 165,318,000 200,104,000 165,318,000 200,104,000 186,982,000
Acquired with deteriorated credit quality 2,540,000 208,000 2,540,000 208,000 2,804,000
Loans 170,191,000 202,638,000 170,191,000 202,638,000 192,506,000
Unallocated Financing Receivables [Member]          
Beginning balance 109,000 225,000 117,000 282,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 390,000 (225,000) 382,000 (282,000)  
Ending balance 499,000 0 499,000 0  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 499,000 0 499,000 0 117,000
Individually evaluated for impairment
Collectively evaluated for impairment
Acquired with deteriorated credit quality
Loans