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Note 9 - Share-based Compensation and Employee Benefit Plan (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Labor and Related Expense | $ 3,460,000 | $ 3,480,000 | $ 10,966,000 | $ 10,272,000 |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  | $ 0.01 |  | $ 0.01 |
Payments of Ordinary Dividends, Common Stock |  | $ 39,000 |  | $ 116,000 |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  | 6.00% |  |
Defined Contribution Plan, Cost | 48,000 | 53,000 | $ 199,000 | 195,000 |
Restricted Stock [Member] |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 226,000 |  | $ 226,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 361 days |  |
2012 Stock Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 3,000,000 |  | 3,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,850,139 |  | 2,850,139 |  |
Share-based Payment Arrangement, Expense | $ 42,000 | 59,000 | $ 123,000 | 162,000 |
2012 Stock Plan [Member] | Employee [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | 21,000 | 31,000 | 64,000 | 87,000 |
2012 Stock Plan [Member] | Patriot's External Directors [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | 21,000 | 28,000 | 59,000 | 75,000 |
Labor and Related Expense | $ 87,000 | $ 153,000 | $ 342,000 | $ 423,000 |
2012 Stock Plan [Member] | Phantom Share Units (PSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) | 0 |  | 0 |  | 0
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 5 years |  |
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |

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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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