Note 1 - Basis of Financial Statement Presentation - Effect on Unaudited Condensed Consolidated Balance Sheet and Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Loans, net of allowance for loan losses	$ 123,193		$ 123,193		$ 116,164
Total assets	146,256		146,256		139,992
Retained earnings	4,983		4,983		5,070
Total stockholders’ equity	11,770	$ 11,781	11,770	$ 11,781	11,845	$ 11,711
Total liabilities and stockholders’ equity	146,256		146,256		139,992
Service fees	68	65	138	139
Total noninterest income	106	218	253	398
Compensation and employee benefits	659	617	1,275	1,194
Professional fees	65	75	151	152
Total noninterest expense	1,298	1,250	2,564	2,437
Income before income taxes	(80)	46	(87)	79
Net income	$ (80)	$ 46	$ (87)	$ 79
Earnings per share basic (in dollars per share)	$ (0.10)	$ 0.06	$ (0.10)	$ 0.09
Earnings per share dilutive (in dollars per share)	$ (0.10)	$ 0.06	$ (0.10)	$ 0.09
Scenario, Previously Reported [Member]
Loans, net of allowance for loan losses					116,674
Total assets					140,502
Retained earnings					5,580
Total stockholders’ equity					12,355
Total liabilities and stockholders’ equity					140,502
Service fees		$ 65		$ 138
Total noninterest income		218		397
Compensation and employee benefits		614		1,188
Professional fees		61		121
Total noninterest expense		1,233		2,400
Income before income taxes		63		115
Net income		$ 63		$ 115
Earnings per share basic (in dollars per share)		$ 0.08		$ 0.14
Earnings per share dilutive (in dollars per share)		$ 0.08		$ 0.14
Restatement Adjustment [Member]
Loans, net of allowance for loan losses					(510)
Total assets					(510)
Retained earnings					(510)
Total stockholders’ equity					(510)
Total liabilities and stockholders’ equity					$ (510)
Service fees				$ 1
Total noninterest income				1
Compensation and employee benefits		3		6
Professional fees		14		31
Total noninterest expense		17		37
Income before income taxes		(17)		(36)
Net income		$ (17)		$ (36)
Earnings per share basic (in dollars per share)		$ (0.02)		$ (0.05)
Earnings per share dilutive (in dollars per share)		$ (0.02)		$ (0.05)

Home Bancorp Wisconsin, Inc. 10-Q