Annual report pursuant to Section 13 and 15(d)

Note 5 - Accounts Receivable Line of Credit (Details Textual)

v3.19.1
Note 5 - Accounts Receivable Line of Credit (Details Textual) - USD ($)
1 Months Ended
Mar. 11, 2019
May 06, 2015
May 31, 2018
May 31, 2017
Mar. 30, 2019
Mar. 31, 2018
New Amended Credit Facility 2 [Member]            
Long-term Line of Credit, Total   $ 2,500,000        
Advance Rate   80.00%        
Line of Credit Facility, Commitment Fee Amount     $ 12,500 $ 12,500    
Asset Coverage Ratio   150.00%        
Accounts Receivable, Aging from Invoice Date   90 days        
New Amended Credit Facility 2 [Member] | Borrowing Base for International Services Sub-Limit [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500,000        
New Amended Credit Facility 2 [Member] | Formula-Basis Sub-Limit [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   2,000,000        
New Amended Credit Facility 2 [Member] | Non-Formula Basis Sub-Limit [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 500,000        
Restated Financing Agreement [Member]            
Long-term Line of Credit, Total         $ 0 $ 552,000
Line of Credit Facility, Maximum Borrowing Capacity $ 2,500,000          
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Debt Instrument, Fee Amount $ 14,700          
Debt Instrument, Basis Spread in Case of Default 5.00%          
Restated Financing Agreement [Member] | Maximum [Member]            
Advance Rate, Percent of Invoices Issued 85.00%          
Restated Financing Agreement [Member] | Minimum [Member]            
Debt Instrument, Interest Rate, Stated Percentage 4.50%