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Note 10 - Stock Option Plans (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended | 204 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2000 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2019 | Jun. 30, 2015 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 107,000 | 40,000 |  | 947,320 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 42,000 | 12,000 |  | 1,356,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total |  | 16,000 | 8,000 |  | 282,680 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  | 84,500 | 179,000 |  | 84,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  | 42,000 |  |  | 42,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  | 10 years | 10 years |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 414,000 |  |  | $ 414,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 182 days |  |  |  |  |
Minimum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 2 years |  |  |  |  |
Maximum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |
The 2003 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  | 450,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted |  |  |  |  |  |  | 197,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 25,000 | 0 |  |  |  |
The 2015 Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 750,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 0 | 20,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 30,000 | 0 |  |  |  |
The Directors Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 200,000 |  |  |  |  |  |
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted | 60,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 8,000 | 12,000 |  |  |  |
Number Of Options Each Director Received At Each Annual Meeting | 4,000 |  |  |  |  |  |
Options Vesting Percentage On First And Second Anniversary | 50.00% |  |  |  |  |  |
The Directors Plan [Member] | Director [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 5,000 |  |  |  |  |  |
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 74,000 | 8,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 12,000 | 12,000 |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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