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Note 11 - Capital Stock and Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 16, 2019 | Apr. 02, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2000 | Dec. 31, 2019 | May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  |  |  |  | 85.00% |  |
Increase In Number Of Shares Authorized For Issuance Under Stock Option And Incentive Plan (in shares) | 350,000 | 3,400,000 |  |  |  |  |
Employee Stock Purchase Plan Shares Authorized (in shares) |  |  |  |  |  |  | 1,400,000
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total (in shares) |  |  |  |  |  | 1,081,404 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  | 0 |  |  |  |
Employee Stock Ownership Plan, Shares Available for Issuance (in shares) |  |  | 318,596 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 20,908,929 | 275,419 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 3.3 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 1.18 |  |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year) |  |  | 10 years |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  |  | 4,222,745 | 3,691,304 |  |  |
Deferred stock awards of Market Condition RSU, Approved 2019 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  | 529,491 |  |  |  |
Maximum Percentage Of Target, Number of Restricted Stock Units |  |  | 150.00% |  |  |  |
Share-based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 1 year |  |  |  |
Share-based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |  |  |

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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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