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Note 7 - Share-based Compensation and Employee Benefit Plan (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Labor and Related Expense	$ 2,854,000	$ 2,497,000	$ 5,623,000	$ 4,927,000
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	$ 65,000	60,000	$ 116,000	94,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.01		$ 0.01
Payments of Ordinary Dividends, Common Stock	$ 39,000	$ 0	$ 77,000	$ 0
Common Stock, Dividends, Per Share, Declared		$ 0		$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	4,124	5,084	18,323	5,084
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	1,968		4,903	2,231
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	1,104	6,000	1,204	6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	38,086	32,117	38,086	32,117	37,034	25,870	33,033	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	2,869,913		2,869,913
Allocated Share-based Compensation Expense, Total	$ 54,000	$ 25,000	$ 107,000	$ 68,000
2012 Stock Plan [Member] | Employee [Member]
Allocated Share-based Compensation Expense, Total	32,000	4,000	67,000	32,000
2012 Stock Plan [Member] | Patriot's External Directors [Member]
Allocated Share-based Compensation Expense, Total	22,000	21,000	40,000	36,000
2012 Stock Plan [Member] | Patriot's External Directors [Member] | Other Nonoperating Income (Expense) [Member]
Labor and Related Expense	$ 77,000	$ 77,000	$ 159,000	$ 146,000
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			0
2012 Stock Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	1,968	0	4,903	2,231
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	1,104	6,000	1,204	6,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 485,000		$ 485,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 281 days
2012 Stock Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0		11,200
2012 Stock Plan [Member] | Restricted Stock [Member] | Executive Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0		2,999
2012 Stock Plan [Member] | Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	4,124	5,084	4,124
2012 Stock Plan [Member] | Restricted Stock [Member] | Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				0
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	0	100	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 16,000		$ 16,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	6,200		6,200
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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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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