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Note 13 - Capital Stock (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 03, 2018 | May 24, 2018 | Apr. 02, 2018 | May 18, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2000
Preferred Stock, Shares Authorized |  |  |  |  | 5,000,000 | 5,000,000 |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  | 0 |  |
Employee Stock Purchase Plan, Consecutive Payment Periods |  |  |  |  |  |  | 180 days
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 |  |  | 3,400,000 | 350,000 |  |  |
Employee Stock Purchase Plan Shares Authorized |  |  |  | 1,400,000 |  |  |
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total |  |  |  |  |  | 1,081,404 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  |  | 190,642 | 89,308 |
Employee Stock Ownership Plan, Shares Available for Issuance |  |  |  |  | 318,596 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 20,908,929 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  | 4,386,063 | 3,307,438 |
Share Price |  |  |  |  | $ 3.05 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | $ 189,069 | $ 2,600,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 3,700,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 1.40 | $ 1.83 |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term |  |  |  |  | 10 years |  |
Preferred Stock, Shares Issued, Total |  |  |  |  | 0 |  |
Deferred Stock Awards of Market Condition RSU, Approved Aug 2015 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days | 20 days |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 69,667 |  |  |  |  |  |
Deferred stock awards of Market Condition RSU, Approved May 2018 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days |  | 20 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  | $ 4.19 |
Deferred stock awards of Market Condition RSU, Approved 2019 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Trading Days |  |  |  |  | 20 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  | 529,491 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years |  |
Maximum Percentage Of Target, Number of Restricted Stock Units |  |  |  |  | 150.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 1.98 |  |
Share-based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 1 year |  |
Share-based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 4 years |  |

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- Definition Discount rate from fair value on offering date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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