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Note 7 - Share-based Compensation and Employee Benefit Plan (Details Textual) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 04, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Labor and Related Expense |  | $ 3,184,000 | $ 2,769,000 |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.01 | $ 0.01 |
Payments of Ordinary Dividends, Common Stock |  | $ 39,000 | $ 38,000 |
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 |  | $ 54,000 | $ 51,000 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  | 100 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 8,936 | 2,935 |
2012 Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 3,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 2,870,113 |  |
Share-based Payment Arrangement, Expense |  | $ 48,000 | $ 53,000 |
2012 Stock Plan [Member] | Employee [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | 28,000 | 35,000 |
2012 Stock Plan [Member] | Patriot's External Directors [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | 20,000 | 18,000 |
2012 Stock Plan [Member] | Patriot's External Directors [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |
Labor and Related Expense |  | $ 119,000 | $ 82,000 |
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 |  | 0 |  | 0
2012 Stock Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 324,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 2 years 109 days |  |
2012 Stock Plan [Member] | Restricted Stock [Member] | Non-executive Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | 0 | 100 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 6,000 |  |  |
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 |  | 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 |  | 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 |  | 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=116856206&loc=d3e5070-113901 + Details
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