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Note 6 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)	Dec. 31, 2019	Mar. 31, 2019
Derivative liabilities	$ 0	$ 4,942,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Cash equivalents	21,230,000	41,839,000
Marketable securities	35,047,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Warrant [Member]
Derivative liabilities		4,942,000
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	21,230,000	41,839,000
Marketable securities	35,047,000
Derivative liabilities		0
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0
Marketable securities
Derivative liabilities		0
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0
Marketable securities
Derivative liabilities		$ 4,942,000

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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