Alico, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares	Nov. 30, 2017 $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 executive $ / shares shares	May 31, 2017 shares	Mar. 31, 2017 shares
Class of Stock [Line Items]
Shares issued (in dollars per share)	$ 27.15			$ 27.15
Period of consecutive trading days	20 days
Period following an executive's termination of employment for a number of reasons	18 months
Shares of common stock authorized to be repurchased (up to) (in shares) \| shares			477,500		7,000,000	50,000		2,000,000	5,000,000
Corporate, General and Administrative Expense
Class of Stock [Line Items]
Stock-based compensation expense \| $			$ 192	$ 255
Remy W. Trafelet
Class of Stock [Line Items]
Options granted in period (in shares) \| shares	300,000
Henry R. Slack
Class of Stock [Line Items]
Options granted in period (in shares) \| shares	225,000
Tranche One
Class of Stock [Line Items]
Percentage of options	25.00%
Amount per share (in dollars per share)	$ 60.00
Tranche Two
Class of Stock [Line Items]
Percentage of options	25.00%
Amount per share (in dollars per share)	$ 75.00
Tranche Three
Class of Stock [Line Items]
Percentage of options	25.00%
Amount per share (in dollars per share)	$ 90.00
Tranche Four
Class of Stock [Line Items]
Percentage of options	25.00%
Amount per share (in dollars per share)	$ 105.00
Restricted Stock
Class of Stock [Line Items]
Stock-based compensation expense \| $					$ 26	$ 150
Restricted shares awarded (in shares) \| shares		5,000					12,500
Number of senior executives \| executive							2
Weighted average fair value (in dollars per share)		$ 31.95					$ 49.49
Award vesting period		3 years
Unrecognized expense \| $	$ 413		283	413
Employee Stock Option
Class of Stock [Line Items]
Stock-based compensation expense \| $			$ 205	$ 0
Unrecognized expense \| $					$ 1,822	$ 2,646
Weighted average remaining contractual term			2 years 3 months 19 days
Weighted average grant date fair value of option grants (in dollars per share)					$ 3.53
Minimum \| Restricted Stock
Class of Stock [Line Items]
Award vesting period							3 years
Maximum \| Restricted Stock
Class of Stock [Line Items]
Award vesting period							5 years