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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Nov. 13, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  | 200,000 |  | 200,000 |
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) |  | 67,000 |  | 150,000 |
Fair Value Adjustment of Warrants |  | $ (1,145) |  | $ (4,092) |
Hudson Warrant [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 818,181 |  | 818,181 | 58,823
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 7.81 |  | $ 7.81 |
Average Common Stock Price (in dollars per share) |  | $ 8.50 |  | $ 9.56 |
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares) |  | 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 (in shares) | 100,000 |  | 100,000 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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