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Note 17 - Stock Option and Purchase Plans (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 3,598,271 | 1,153,271
Share-based Payment Arrangement, Expense | $ 426,000 | $ 469,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ 0.33 | $ 0.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | 306,500 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 392,000 |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 423,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 36 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 113,000 | $ 318,000
The 2015 Omnibus Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Lapsing Restrictions Period (Year) | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 5 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |
The 2020 Omnibus Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Lapsing Restrictions Period (Year) | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |
Share-based Payment Arrangement, Option [Member] | The 2015 Omnibus Plan [Member] |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 3,476,021 |
Share-based Payment Arrangement, Option [Member] | The 2020 Omnibus Plan [Member] |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 4,596,271 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 392,000 | $ 533,000

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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