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Note 14 - Employee Benefit Plans (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Percent of employee contributions matched | 4.50% |  |  |
Discretionary contributions | $ 0 | $ 0 | $ 0 |
Deferred compensation liability, current and noncurrent | 15,029,405 | 12,346,935 | 10,455,183 | $ 8,875,025
Deferred compensation matching contributions | 1,406,959 | 932,921 | $ 794,168 |
Minimum | Certain Executive Officers [Member] |  |  |  |
Deferred compensation matching contributions | $ 8,000 |  |  |
Interest on deferred compensation amounts | 4.00% |  |  |
Maximum | Certain Executive Officers [Member] |  |  |  |
Deferred compensation matching contributions | $ 25,000 |  |  |
Interest on deferred compensation amounts | 12.00% |  |  |
Certain Management Officers [Member]s [Member] |  |  |  |
Deferred compensation liability, current and noncurrent | $ 15,000,000 | $ 12,300,000 |  |
Number of monthly installment payments | 180 months |  |  |
Certain Management Officers [Member]s [Member] | Minimum |  |  |  |
Company matching contribution percent (as a percent) | 4.00% |  |  |
Interest on deferred compensation amounts | 4.00% |  |  |
Certain Management Officers [Member]s [Member] | Maximum |  |  |  |
Company matching contribution percent (as a percent) | 10.00% |  |  |
Interest on deferred compensation amounts | 8.00% |  |  |
First 3% of Employees Wages [Member] |  |  |  |
Company matching contribution percent (as a percent) | 100.00% |  |  |
Match at 100% [Member] |  |  |  |
Percent of employee contributions matched | 3.00% |  |  |
From 4% to 4.5% of Employees Wages [Member] |  |  |  |
Company matching contribution percent (as a percent) | 50.00% |  |  |
Matched at 50% [Member] |  |  |  |
Percent of employee contributions matched | 3.00% |  |  |

X
- Definition The amount of discretionary contributions made by the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interest on deferred compensation amounts. + References No definition available. + Details
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Balance Type: | na
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- Definition The number of monthly installment payments. + References No definition available. + Details
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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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- Details
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- Details
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- Details
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- Details
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