Consolidated Balance Sheets (Parentheticals) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Market securities, common stock	$ 158,462,000	$ 158,705,000
Market securities, bonds	8,172,000	7,336,000
Accounts receivable, allowance for doubtful accounts	$ 200,000	$ 250,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, shares issued (in shares)	1,805,053	1,805,053
Common stock, treasury shares (in shares)	424,307	424,307