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Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts $ 68,589 $ 68,589
Right of use lease, amortization 107,987 97,725
Senior secured note payable, long-term, debt issuance costs $ 86,538 $ 99,852
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 8,579,877 8,410,386
Common stock, shares outstanding (in shares) 8,579,877 8,410,386
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 5,000,000 5,000,000
Preferred stock, shares outstanding (in shares) 5,000,000 5,000,000
Convertible Notes Payable [Member]    
Convertible notes payable, discount $ 102,727 $ 194,267
Machinery and Equipment [Member]    
Property and equipment, depreciation $ 66,285 $ 61,961