Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Accounts receivable, allowances	$ 159	$ 135
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)		6,749,359
Common stock, shares outstanding (in shares)		6,736,643
Treasury stock, shares (in shares)	12,716	12,716
9% Preferred Stock, Series A, Voting, Cumulative, Convertible
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	4,500	4,500
Preferred stock, issued (in shares)	0	0
5% Preferred Stock, Series B, Voting, Cumulative, Convertible
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock liquidation preference, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, issued (in shares)	0	0
Preferred stock, dividend rate (usd per share)	5.00%	5.00%