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Note 6 - Factoring (Details Textual)
3 Months Ended
Mar. 31, 2020
USD ($)
Factoring Arrangement, Minimum Amount of Accounts Receivable Per Quarter $ 150,000
Minimum [Member]  
Factoring Fees Percent 2.75%
Maximum [Member]  
Factoring Fees Percent 15.00%
Geographic Distribution, Foreign [Member]  
Percentage Of Accounts Receivable Remitted By Factor 35.00%
Geographic Distribution, Domestic [Member]  
Percentage Of Accounts Receivable Remitted By Factor 75.00%