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Note 12 - Fair Value Measurements (Details) - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [
12 Months Ended
Mar. 31, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance $ 0
(Gains) and losses for the period (realized and unrealized) 23,000
Purchases, issuances, sales and settlements, net 0
Transfers in or out of Level 3 0
Balance 23,000
Warrant [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance 0
(Gains) and losses for the period (realized and unrealized) 23,000
Purchases, issuances, sales and settlements, net 0
Transfers in or out of Level 3 0
Balance $ 23,000