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Note 7 - Fair Value of Financial Instruments - Summary of Financial Instruments (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Reported Value Measurement [Member]    
Revolving line of credit $ 500,000  
Marketable securities   $ 339,000
Reported Value Measurement [Member] | Distributor [Member]    
Note receivable 1,282,072 1,405,112
Reported Value Measurement [Member] | Nutracom, LLC [Member]    
Note receivable 1,171,746  
Estimate of Fair Value Measurement [Member]    
Revolving line of credit 500,000  
Marketable securities   339,000
Estimate of Fair Value Measurement [Member] | Distributor [Member]    
Note receivable 1,400,000 1,529,000
Estimate of Fair Value Measurement [Member] | Nutracom, LLC [Member]    
Note receivable 1,169,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Revolving line of credit  
Marketable securities   339,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Distributor [Member]    
Note receivable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Nutracom, LLC [Member]    
Note receivable  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Revolving line of credit 500,000  
Marketable securities  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Distributor [Member]    
Note receivable 1,400,000 1,529,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Nutracom, LLC [Member]    
Note receivable  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Revolving line of credit  
Marketable securities  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Distributor [Member]    
Note receivable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Nutracom, LLC [Member]    
Note receivable $ 1,169,000