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Note 10 - Stock Option Plans - Stock Options Outstanding and Exercisable (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number Outstanding (in shares) | 126,500 | 207,500 | 243,500
Options Outstanding Exercise Price Range1 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 1.52 |  |
Upper Range of Exercise Price (in dollars per share) | $ 1.72 |  |
Number Outstanding (in shares) | 67,500 |  |
Wgt. Avg. Contractual Life Remaining (yrs) (Year) | 1 year 182 days |  |
Wgt. Avg. Exercise Price (in dollars per share) | $ 1.59 |  |
Aggregate Intrinsic Value | $ 2,588,850 |  |
Options Exercisable Exercise Price Range 1 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 1.52 |  |
Upper Range of Exercise Price (in dollars per share) | $ 1.72 |  |
Exercisable Options (in shares) | 67,500 |  |
Weighted-Average Contractual Life Remaining - Exercisable (Year) | 1 year 182 days |  |
Weighted-Average Exercise Price - Exercisable (in dollars per share) | $ 1.59 |  |
Aggregate Intrinsic Value - Exercisable | $ 2,588,850 |  |
Options Outstanding Exercise Price Range2 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 3.50 |  |
Upper Range of Exercise Price (in dollars per share) | $ 39.11 |  |
Number Outstanding (in shares) | 59,000 |  |
Wgt. Avg. Contractual Life Remaining (yrs) (Year) | 8 years 219 days |  |
Wgt. Avg. Exercise Price (in dollars per share) | $ 17.35 |  |
Aggregate Intrinsic Value | $ 1,332,740 |  |
Options Exercisable Exercise Price Range 2 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 3.50 |  |
Upper Range of Exercise Price (in dollars per share) | $ 7.80 |  |
Exercisable Options (in shares) | 17,000 |  |
Weighted-Average Contractual Life Remaining - Exercisable (Year) | 7 years 182 days |  |
Weighted-Average Exercise Price - Exercisable (in dollars per share) | $ 4.70 |  |
Aggregate Intrinsic Value - Exercisable | $ 599,040 |  |
Options Outstanding Exercise Price Range 3 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 1.52 |  |
Upper Range of Exercise Price (in dollars per share) | $ 39.11 |  |
Number Outstanding (in shares) | 126,500 |  |
Wgt. Avg. Contractual Life Remaining (yrs) (Year) | 4 years 292 days |  |
Wgt. Avg. Exercise Price (in dollars per share) | $ 8.94 |  |
Aggregate Intrinsic Value | $ 3,921,590 |  |
Options Exercisable Exercise Price Range3 [Member] |  |  |
Lower Range of Exercise Price (in dollars per share) | $ 1.52 |  |
Upper Range of Exercise Price (in dollars per share) | $ 7.80 |  |
Exercisable Options (in shares) | 84,500 |  |
Weighted-Average Contractual Life Remaining - Exercisable (Year) | 2 years 255 days |  |
Weighted-Average Exercise Price - Exercisable (in dollars per share) | $ 2.21 |  |
Aggregate Intrinsic Value - Exercisable | $ 3,187,890 |  |

X
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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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