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Note 7 - Share-based Compensation and Employee Benefit Plan (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Labor and Related Expense	$ 2,794,000	$ 2,741,000	$ 8,417,000	$ 7,668,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.01		$ 0.01
Payments of Ordinary Dividends, Common Stock	$ 39,000	39,000	$ 116,000	39,000
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	$ 38,000	$ 37,000	$ 154,000	$ 132,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	200	600	1,404	6,600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	35,498	29,825	35,498	29,825	38,086	25,870	32,117	35,264
2012 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	3,000,000		3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,870,113		2,870,113
Allocated Share-based Compensation Expense, Total	$ 56,000	$ 37,000	$ 163,000	$ 105,000
2012 Stock Plan [Member] | Employee [Member]
Allocated Share-based Compensation Expense, Total	33,000	16,000	100,000	48,000
2012 Stock Plan [Member] | Patriot's External Directors [Member]
Allocated Share-based Compensation Expense, Total	23,000	21,000	63,000	57,000
2012 Stock Plan [Member] | Patriot's External Directors [Member] | Other Nonoperating Income (Expense) [Member]
Labor and Related Expense	$ 77,000	$ 80,000	$ 241,000	$ 226,000
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]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 428,000		$ 428,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 222 days
2012 Stock Plan [Member] | Restricted Stock [Member] | Non-executive Employees [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 8,000		$ 8,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	200	600	300	600
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	6,000		6,000
2012 Stock Plan [Member] | Restricted Stock [Member] | Share-based Compensation Award, 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 Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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