Consolidated Balance Sheets (Parentheticals) - $ / shares $ / shares in Thousands	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Preferred stock, shares outstanding (in shares)	0	0	0
Common Class A [Member]
Class of common stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Class of common stock, shares authorized (in shares)	10,000,000	10,000,000	10,000,000
Class of common stock, shares issued (in shares)	2,130,681	2,130,681	2,090,394
Treasury shares (in shares)	15,795	15,795	15,795
Common Class B [Member]
Class of common stock, par value (in dollars per share)	$ 0	$ 0	$ 0
Class of common stock, shares authorized (in shares)	2,500,000	2,500,000	2,500,000
Class of common stock, shares issued (in shares)	779,283	779,283	779,283
Treasury shares (in shares)	5,667	5,667	5,667