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Note 13 - Summary of Subsequent Events (Details Textual) - USD ($)
 3 Months Ended 5 Months Ended
Apr. 01, 2020
Jan. 13, 2020
Mar. 31, 2019
Mar. 31, 2018
May 18, 2020
Jan. 03, 2020
Revenue from Contract with Customer, Including Assessed Tax     $ 12,536,389 $ 13,979,177    
Subsequent Event [Member]            
Proceeds from Paycheck Protection Program Under CARES Act $ 1,000,000          
Forecast [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member]            
Debt Conversion, Original Debt, Amount $ 482,000          
Forecast [Member] | Series A Preferred Stock [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member]            
Debt Conversion, Converted Instrument, Shares Issued (in shares) 48,200          
Forecast [Member] | Purchase Agreement [Member] | Series A Preferred Stock [Member]            
Sale of Stock, Shares Agreed to Purchase (in shares)           500,000
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)           10
Shares Issued, Price Per Share (in dollars per share)           $ 10
Sale of Stock, Offering Amount           $ 5,000,000
Proceeds from Issuance or Sale of Equity, Total         $ 4,926,600  
Stock Issued During Period, Shares, New Issues (in shares)         492,660  
Forecast [Member] | Additional Offering [Member] | Series A Preferred Stock [Member]            
Shares Issued, Price Per Share (in dollars per share)           $ 10
Sale of Stock, Contingent Additional Offered Shares (in shares)           200,000
Forecast [Member] | First Closing of the Offering [Member] | Series A Preferred Stock [Member]            
Proceeds from Issuance or Sale of Equity, Total   $ 2,500,000        
Ziploc [Member]            
Revenue from Contract with Customer, Including Assessed Tax     $ 2,200,000