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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Number of Major United States Financial Institutions 2  
Allowance for Doubtful Accounts Receivable $ 0 $ 0
Depreciation, Depletion and Amortization 206,000 291,000
Impairment of Long-Lived Assets Held-for-use $ 0 $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 2,941,861 3,509,241
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 $ 0 $ 0
Income Tax Examination, Penalties and Interest Accrued $ 0 $ 0
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