Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2011	Mar. 31, 2011
Condensed Consolidated Balance Sheets
Accounts receivable - trade, allowance for doubtful accounts (in dollars)	$ 163	$ 161
PROPERTY, PLANT AND EQUIPMENT, accumulated depreciation (in dollars)	5,347	2,871
INTANGIBLE ASSETS, accumulated amortization (in dollars)	$ 3,062	$ 1,558
General partner, interest (as a percent)	0.10%	0.10%
General partner, notional units outstanding	14,799	10,945
Limited partners, interest (as a percent)	99.90%	99.90%
Common units, units outstanding	8,864,222	10,933,568
Subordinated units, units outstanding	5,919,346	0