Stock-Based Compensation Plans (Details Narrative) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Years shares	Dec. 29, 2017 $ / shares	Jan. 30, 2015
Number of stock option plans	2
Options expire from date of grant	10 years
Exercisable installments	Immediate or 20% or 25%
Shares available for future issuance \| shares	544,217
Dividend yield	0.00%
Expected minimum volatility	32.00%
Expected maximum volatility	43.00%
FRP options replacement			75.14%
Patriot options replacement			24.86%
Risk-free interest rate minimum	0.60%
Risk-free interest rate maximum	4.20%
Expected life minimum \| Years	3.0
Expecited life maximum \| Years	7.0
Aggregate intrinsic value of exercisable in-the-money options	$ 2,418
Aggregate intrinsic value of outstanding in-the-money options	2,719
Market close price \| $ / shares		$ 44.25
Gains realized by option holders	1,634
Total unrecognized compensation cost of options granted but not yet vested	$ 583
Weighted average period for compensation to be recognized \| Years	4.1
Modification stock compensation expense	$ 41
Patriot Transportation
Realized tax benefit from options exercised	1,525
Modification stock compensation expense	$ 150

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Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification
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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Price of a single share of a number of saleable stocks of a company.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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