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Note 16 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 341,245 | $ 274,759 | $ 197,214
Employee Stock Purchase Plan, Percent of Wages Withheld, Maximum | 10.00% |  |
Employee Stock Purchase Plan, Max Annual Contribution by Employees | $ 10,000 |  |
Percent of Purchase Price to Company's Common Stock on Last Day of Offering Period | 85.00% |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 107,995 | $ 79,095 | $ 106,775
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 3,280 | 2,241 | 9,209
Employee Stock Purchase Plan, Shares Authorized (in shares) |  |  | 100,000
Employee Stock Purchase Plan, Employer Expense During Period | $ 35,348 | $ 28,937 | $ 31,748

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- Definition The employer expense for the employee stock purchase plan. + References No definition available. + Details
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- Definition The maximum annual contribution by employees to the employee stock purchase plan. + References No definition available. + Details
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- Definition Employee Stock Purchase Plan, Percent of Wages Withheld, Maximum Amount an Employee can withhold to purchase stock. + References No definition available. + Details
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- Definition Number of shares authorized for the employee stock purchase plan. + References No definition available. + Details
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- Definition Percent of Purchase Price to Company's Common Stock on Last Day of Offering Period. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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