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Note 14 - Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 4.50%      
Defined Contribution Plan, Cost Recognized $ 297,826 $ 650,016 $ 264,672  
Deferred Compensation Liability, Current and Noncurrent 8,875,025 7,503,692 6,224,368 $ 5,151,630
Deferred Compensation Arrangement with Individual, Employer Contribution 693,656 628,589 525,469  
Supplemental Executive Retirement Plans [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Deferred Compensation Arrangement with Individual, Recorded Liability 317,418      
Deferred Compensation Liability, Current and Noncurrent 3,934,605 3,800,603    
Defined Benefit Plan, Contributions by Employer 163,824 117,000 $ 117,000  
Agreements with Certain Management and Executive Officers [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Deferred Compensation Liability, Current and Noncurrent $ 8,875,025 $ 7,503,692    
First 3% of Employees Wages [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 100.00%      
Match at 100% [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 3.00%      
From 4% to 4.5% of Employees Wages [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 50.00%      
Matched at 50% [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 3.00%      
Minimum [Member] | Certain Executive Officers [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Deferred Compensation Arrangement with Individual, Employer Contribution $ 8,000      
Interest on Deferred Compensation Amounts 4.00%      
Minimum [Member] | Certain Management Officers [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%      
Interest on Deferred Compensation Amounts 4.00%      
Maximum [Member] | Certain Executive Officers [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Deferred Compensation Arrangement with Individual, Employer Contribution $ 25,000      
Interest on Deferred Compensation Amounts 12.00%      
Maximum [Member] | Certain Management Officers [Member]        
Note 14 - Employee Benefit Plans (Details) [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 10.00%      
Interest on Deferred Compensation Amounts 8.00%