Represents the amount of unrecognized compensation cost.

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The number of shares contributed to the company.

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- Definition

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

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

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- 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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- Definition

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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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Number of share instruments newly issued under a share-based compensation plan.

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

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

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Note 13 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions			12 Months Ended
	Apr. 03, 2017 $ / shares shares	Jan. 10, 2017 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 30, 2016 shares
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense \| $			$ 0.2	$ 0.1	$ 0.1
Employee Service Share-based Compensation, Compensation Not yet Recognized \| $			$ 4.4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 292 days
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense, Total \| $			$ 4.4	$ 10.6	$ 5.4
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period			442,820
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			955,424
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price \| $ / shares			$ 1.76
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			2,200,000
2015 Long-Term Incentive Compensation Plan [Member] \| Time-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	126,953		88,851
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 8.96		$ 10.27
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%		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%		200.00%
2015 Long-Term Incentive Compensation Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	171,388		178,648
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 8.98		$ 10.73
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments	3		3
2015 Long-Term Incentive Compensation Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			38,555
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares			$ 12.97
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, 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
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments		3