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Note 8 - Earnings (Loss) Per Share - Calculation of Diluted Weighted-average Shares Outstanding (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic:    
Net income (loss) available to common shareholders $ 370,627 $ (197,750)
Less: Earnings allocated to participating securities (8,495)
Net income (loss) allocated to common shareholders $ 362,132 $ (197,750)
Weighted-average common shares outstanding including participating securities (in shares) 3,444,390 3,438,190
Less: Average participating securities (in shares) (74,907)
Less: Average unallocated ESOP Shares (in shares) (176,102) (181,887)
Average shares (in shares) 3,193,381 3,256,303
Basic (in dollars per share) $ 0.11 $ (0.06)
Diluted:    
Net income allocated to common shareholders $ 362,132 $ (197,750)
Weighted-average common shares outstanding for basic earnings per common share (in shares) 3,193,381 3,256,303
Add: Dilutive effects of assumed exercises of stock options (in shares) 13,745
Weighted average shares and dilutive potential common shares (in shares) 3,207,126 3,256,303
Diluted (in dollars per share) $ 0.11 $ (0.06)