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Note 14 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.50% |  |  |
Defined Contribution Plan, Cost | $ 400,784 | $ 322,575 | $ 297,826 |
Deferred Compensation Liability, Current and Noncurrent | 12,346,935 | 10,455,183 | 8,875,025 | $ 7,503,692
Deferred Compensation Arrangement with Individual, Contributions by Employer | 932,921 | 794,168 | 693,656 |
Minimum [Member] | Certain Executive Officers [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 8,000 |  |  |
Interest on Deferred Compensation Amounts | 4.00% |  |  |
Maximum [Member] | Certain Executive Officers [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Contributions by Employer | $ 25,000 |  |  |
Interest on Deferred Compensation Amounts | 12.00% |  |  |
Supplemental Executive Retirement Plans [Member] |  |  |  |
Deferred Compensation Liability, Current and Noncurrent | $ 4,330,313 | 4,093,355 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 163,826 | 163,825 | $ 163,824 |
Certain Management Officers [Member]s [Member] | Minimum [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 4.00% |  |  |
Interest on Deferred Compensation Amounts | 4.00% |  |  |
Certain Management Officers [Member]s [Member] | Maximum [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 10.00% |  |  |
Interest on Deferred Compensation Amounts | 8.00% |  |  |
Agreements with Certain Management and Executive Officers [Member] |  |  |  |
Deferred Compensation Liability, Current and Noncurrent | $ 12,346,935 | $ 10,455,183 |  |
First 3% of Employees Wages [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 100.00% |  |  |
Match at 100% [Member] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |  |
From 4% to 4.5% of Employees Wages [Member] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |  |
Matched at 50% [Member] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |  |

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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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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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