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Note 13 - Segment Reporting - Results for Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Net interest income $ 7,314 $ 6,919  
Provision for loan losses 658 515  
Total non-interest income 1,140 1,167  
Total non-interest expense 7,301 7,037  
Income before income taxes 495 534  
Provision for income taxes 81 130  
Net income 414 404  
Total assets 627,319 619,827 $ 625,581
Total investment securities 181,942 213,497  
Total loans, net 353,805 317,677 346,121
Investment in subsidiaries 5 5  
Fixed asset additions 115 4,087  
Depreciation and amortization expense 351 242  
Total interest income from external customers 8,119 7,510  
Total interest income from affiliates  
Intersegment Eliminations [Member]      
Net interest income  
Provision for loan losses  
Total non-interest income (836) (763)  
Total non-interest expense (201) (170)  
Income before income taxes (635) (593)  
Provision for income taxes  
Net income (635) (593)  
Total assets (181,340) (173,601)  
Total investment securities  
Total loans, net (85,043) (76,509)  
Investment in subsidiaries (75,055) (76,976)  
Fixed asset additions  
Depreciation and amortization expense  
Total interest income from external customers  
Total interest income from affiliates (1,093) (1,117)  
FUSB [Member]      
Provision for loan losses 39   (130)
Total loans, net 259,276   254,682
FUSB [Member] | Operating Segments [Member]      
Net interest income 4,117 3,911  
Provision for loan losses 39  
Total non-interest income 867 836  
Total non-interest expense 4,531 4,401  
Income before income taxes 414 346  
Provision for income taxes 70 98  
Net income 344 248  
Total assets 629,954 622,528  
Total investment securities 181,862 213,417  
Total loans, net 344,319 309,425  
Investment in subsidiaries 5 5  
Fixed asset additions 113 4,025  
Depreciation and amortization expense 318 201  
Total interest income from external customers 3,837 3,392  
Total interest income from affiliates 1,089 1,114  
ALC [Member]      
Provision for loan losses 619   2,117
Total loans, net 94,529   $ 91,439
ALC [Member] | Operating Segments [Member]      
Net interest income 3,193 3,005  
Provision for loan losses 619 515  
Total non-interest income 256 244  
Total non-interest expense 2,524 2,377  
Income before income taxes 306 357  
Provision for income taxes 70 130  
Net income 236 227  
Total assets 97,685 88,233  
Total investment securities  
Total loans, net 94,529 84,761  
Investment in subsidiaries  
Fixed asset additions 2 62  
Depreciation and amortization expense 33 41  
Total interest income from external customers 4,282 4,118  
Total interest income from affiliates  
Other Segments [Member] | Operating Segments [Member]      
Net interest income 4 3  
Provision for loan losses  
Total non-interest income 853 850  
Total non-interest expense 447 429  
Income before income taxes 410 424  
Provision for income taxes (59) (98)  
Net income 469 522  
Total assets 81,020 82,667  
Total investment securities 80 80  
Total loans, net  
Investment in subsidiaries 75,055 76,976  
Fixed asset additions  
Depreciation and amortization expense  
Total interest income from external customers  
Total interest income from affiliates $ 4 $ 3