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Note 2 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Number of Entities Consolidated as Variable Interest Entities 3    
Deconsolidation, Gain (Loss), Amount $ 218,534  
Accounts Receivable, Allowance for Credit Loss, Ending Balance 730,000 82,000  
Interest Costs Capitalized 12,000 14,000  
Property, Plant and Equipment, Net, Ending Balance 2,531,072 3,720,912  
Goodwill, Impairment Loss 1,400,000 0  
Research and Development Expense, Total 287,000 375,000  
Advertising Expense 80,000 $ 171,000  
Ziploc Related Long-lived Assets [Member]      
Property, Plant and Equipment, Net, Ending Balance 685,000    
Property, Plant, and Equipment, Salvage Value 300,000    
Depreciation, Total 143,000    
Ziploc Related Long-lived Assets [Member] | Forecast [Member]      
Property, Plant and Equipment, Net, Ending Balance     $ 0
One of Ziploc Related Long-lived Assets Used in Other Products [Member]      
Property, Plant and Equipment, Net, Ending Balance $ 100,000