Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Accounts receivable, allowances	$ 750	$ 575
Customer relationships, amortization	1,123	990
Product rights, amortization	$ 473	$ 411
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)	4,474,062	4,470,791
Common stock, shares outstanding (in shares)	4,461,346	4,458,075
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)	2,500	2,500
Preferred stock, issued (in shares)	2,259	1,510
Preferred stock, dividend rate (usd per share)	9.00%	9.00%
5% Preferred Stock, Series B, Voting, Cumulative, Convertible
Preferred stock liquidation preference, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, dividend rate (usd per share)	5.00%	5.00%