Note 10 - Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation - Fair Value, Inputs, Level 3 [Member]	3 Months Ended
	Jun. 30, 2016 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,136,203
Gains and losses for the period (realized and unrealized)	(217,203)
Purchases, issuances, sales and settlements, net	0
Transfers in or out of Level 3	0
Balance at the end of period	919,000
Warrant [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,136,203
Gains and losses for the period (realized and unrealized)	(217,203)
Purchases, issuances, sales and settlements, net	0
Transfers in or out of Level 3	0
Balance at the end of period	$ 919,000