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Note 7 - EMPLOYEE BENEFIT PLANS - Other (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 15 Months Ended | 128 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2021 | Nov. 16, 2011 shares | Jul. 31, 2001 | Jul. 31, 2001 item | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Dec. 31, 2021 shares | Dec. 31, 2001 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares) |  |  |  |  |  |  | 4,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 133,000 |  | 133,000 |  | 133,000 | 133,000 | 226,000 |
Share Price (in dollars per share) | $ / shares |  |  |  |  | $ 21.51 |  | $ 21.51 |  | $ 21.51 | $ 21.51 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  |  |  | $ 100,000 |  | $ 100,000 |  | $ 100,000 | $ 100,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  |  |  | 24,800,000 |  | $ 24,800,000 |  | $ 24,800,000 | 24,800,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 2 years 3 months 18 days |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  | 4 years |  |  |  |  |
The 2010 Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  | 85.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period |  |  |  | 24 months |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Purchase Period | item |  |  |  | 4 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  |  |  | 5,203 | 99,674 |  |  |  |
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 13.40 | $ 9.24 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  |  |  | 0 |  | $ 0 |  | $ 0 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 6 months |  |  |  |  |  |  |  |
The 2021 Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period | 24 months |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  |  |  | 90,040 |  |  |  |  |
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 15.90 |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  | $ 1,500,000 | $ 1,500,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 1 year 2 months 12 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  | 909,960 |  | 909,960 |  | 909,960 | 909,960 |  |
Twenty Eleven Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 12,800,000 |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in shares) |  | 1.33 |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  | 13,300,000 |  | 13,300,000 |  | 13,300,000 | 13,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 4,500,000 |  | 4,500,000 |  | 4,500,000 | 4,500,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares) |  |  |  |  |  |  |  |  |  | 500,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |
Twenty Eleven Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |  |  |  |  |  |  |
Shares Previously Issued Under the 2001 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,500,000
Outside of the 2011, 2001 or IDS Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 0 |  | 0 |  | 0 | 0 |  |

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- Definition Represents information pertaining to number of purchase period in the offering of employee stock purchase plan. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award is offered, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The reduction rate in the number of shares reserved under the option plan attributable to awards other than options or stock appreciation rights. + References No definition available. + Details
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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 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 The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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