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Note 4 - Computation of Net Loss per Common Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,000	1,600,000	1,000,000	1,400,000
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	67,000	0	150,000	0
Fair Value Adjustment of Warrants	$ (1,145)		$ (4,092)	$ 182
Hudson Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	818,181		818,181
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 7.81		$ 7.81
Average Common Stock Price	$ 8.50		$ 9.56
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	66,638		150,025
Fair Value Adjustment of Warrants	$ (1,100)		$ (4,100)
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		300,000	200,000	200,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	800,000	900,000		900,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		400,000		300,000

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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-SubTopic 10
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