Represents the amount of unrecognized compensation cost.

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- Definition

The number of shares contributed to the company.

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No definition available.

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- Definition

Represents the earn out percentage under share-based compensation arrangement by share-based payment award.

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No definition available.

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- Definition

The number of installments in which the share-based awards vest.

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No definition available.

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- Definition

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

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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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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- Definition

Number of shares issued under share-based payment arrangement.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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Note 12 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions			12 Months Ended
	Apr. 03, 2017	Jan. 10, 2017 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Apr. 30, 2016 shares
Share-based Payment Arrangement, Expense, Tax Benefit \| $			$ 0.1	$ 0.2	$ 0.1
Employee Service Share-based Compensation, Compensation Not yet Recognized \| $			$ 4.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 219 days
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expense \| $			$ 3.6	$ 4.4	$ 10.6
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			5,014
President and Chief Executive Officer [Member]
Number of Contribution Shares									1,000,000
Lindblad Plan and 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			20,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price \| $ / shares			$ 11.26
2015 Long-Term Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			1,300,000
2015 Long-Term Incentive Compensation Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
2015 Long-Term Incentive Compensation Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments	3		3
2015 Long-Term Incentive Compensation Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years		3 years
2015 Long-Term Incentive Compensation Plan [Member] \| Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Earn out Percentage	0.00%
2015 Long-Term Incentive Compensation Plan [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Earn out Percentage	200.00%
2016 CEO Share Allocation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized									1,000,000
2016 CEO Share Allocation Plan [Member] \| Restricted Stock [Member] \| President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments						3	3	3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		716,550
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares		$ 9.65