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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Number of Major United States Financial Institutions 2  
Allowance for Doubtful Accounts Receivable, Ending Balance $ 0 $ 0
Depreciation, Depletion and Amortization, Total 133,000 206,000
Impairment of Long-Lived Assets Held-for-use $ 0 $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 0 2,941,861
Period of Payment Terms Offered to Customers Distributions and Resellers Domestically 30 days  
Period of Payment Terms Offered to Customers Distributors and Resllers Internationally 45 days  
Unrecognized Tax Benefits, Ending Balance $ 0 $ 0
Income Tax Examination, Penalties and Interest Accrued, Total $ 0 $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 39.00%
Equipment and Furniture and Fixtures [Member] | Minimum [Member]    
Property, Plant and Equipment, Useful Life 1 year  
Equipment and Furniture and Fixtures [Member] | Maximum [Member]    
Property, Plant and Equipment, Useful Life 5 years  
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment, Useful Life 2 years  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment, Useful Life 5 years