Summary of Significant Accounting Policies (Prop Plant and Equip) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Property and equipment
Gross property and equipment	$ 35,581	$ 41,160
Less: accumulated depreciation and amortization	(18,577)	(19,937)
Net property and equipment	17,004	21,223
Land and land improvements
Property and equipment
Gross property and equipment	421	1,511
Buildings and building improvements
Property and equipment
Gross property and equipment	11,849	14,441
Furniture, fixtures and office equipment
Property and equipment
Gross property and equipment	7,233	8,600
Leasehold improvements
Property and equipment
Gross property and equipment	148	148
Equipment leased to customers under Power Purchase Agreements
Property and equipment
Gross property and equipment	4,997	4,997
Plant equipment
Property and equipment
Gross property and equipment	10,805	11,084
Construction in progress
Property and equipment
Gross property and equipment	$ 128	$ 379