Operating loss carryforwards (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Loss Carryforwards [Line Items]
Capital loss carryforward	$ 4,582,000	$ 0
Capital loss carryforward, expiration date	Mar. 31, 2020
Capital loss carryforward, valuation allowance	4,600,000
Foreign Tax Authority and Federal and State Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	162,900,000
Operating Loss Carryforwards, Valuation Allowance	$ 52,600,000
Minimum [Member] | Foreign Tax Authority and Federal and State Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Mar. 31, 2016
Maximum [Member] | Foreign Tax Authority and Federal and State Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Mar. 31, 2035