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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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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