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Note 1 - Organization and Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 19, 2022
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Nov. 10, 2022
Dec. 31, 2021
Cash Equivalents, at Carrying Value, Total   $ 3,031,365       $ 3,031,365      
Net Working Capital   661,829       661,829      
Net Cash Provided by (Used in) Operating Activities, Total           456,990 $ 845,795    
Operating Income (Loss), Total   (28,689) $ (144,548)   $ (144,548) 70,846 $ (353,689)    
Retained Earnings (Accumulated Deficit), Total   (70,408,965)       $ (70,408,965)     $ (70,322,550)
Number of Reportable Segments           5      
Accounts Receivable, after Allowance for Credit Loss, Current, Total   304,767       $ 304,767     215,109
Number of Major Customers           0      
Contract with Customer, Liability, Total   $ 11,934       $ 11,934     $ 11,154
Contract with Customer, Liability, Revenue Recognized       $ 11,154          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   22,000 38,000     24,000 37,000    
Subsequent Event [Member]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)               110,000  
Shares Issued, Price Per Share (in dollars per share)               $ 1.00  
Subsequent Event [Member] | Secured Convertible Note [Member] | Embolx, Inc., a California Corporation [Member]                  
Debt Instrument, Face Amount $ 1,875,000                
Debt Instrument, Original Issue Discount, Percentage 20.00%                
Debt Instrument, Term (Month) 9 months                
CANADA                  
Property and Equipment Net Percentages   100.00%       100.00%      
CANADA | Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]                  
Concentration Risk, Percentage   99.00% 99.00%            
UNITED STATES | Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]                  
Concentration Risk, Percentage           1.00% 1.00%