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Note 10 - Stock Compensation Plans (Details Textual) - USD ($) | 1 Months Ended | 4 Months Ended | 12 Months Ended | 216 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2000 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2015 | Dec. 31, 2020 | Aug. 31, 2020 | Jun. 30, 2015 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  | 107,000 |  | 947,320 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 42,000 |  | 1,356,500 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares) |  |  |  | 16,000 |  | 282,680 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) |  | 102,500 | 102,500 | 84,500 |  | 102,500 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  | 24,000 | 24,000 |  |  | 24,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  | 10 years | 10 years |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 235,000 | $ 235,000 |  |  | $ 235,000 |  |  |
Minimum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 2 years |  |  |  |  |  |
Maximum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |  |  |  |
The 2003 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  | 450,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |  |  |  |
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted (in shares) |  |  |  |  |  |  |  |  | 197,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 | 25,000 |  |  |  |  |
The 2015 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 750,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 | 0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 | 30,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares) |  |  |  | 10,000 |  |  |  |  |
The Directors Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 200,000 |  |  |  |  |  |  |  |
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted (in shares) | 60,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 | 8,000 |  |  |  |  |
Number Of Options Each Director Received At Each Annual Meeting (in shares) | 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 (in shares) | 5,000 |  |  |  |  |  |  |  |
The 2011 Non-employee Director Stock Option Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  | 200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 | 74,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 | 12,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares) |  |  | 0 | 6,000 |  |  |  |  |
Three Independent Members of the Board of Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  | 4,380 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  | $ 150,000 |  |  |  |  |  |
Share-Based Compensation Arrangement, Stock to be Granted Per Recipient, Value |  | $ 50,000 |  |  |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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