Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Revenue From Contracts With Customers - Change in Deferred Revenue and Accumulated Deficit (Details)

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Note 4 - Revenue From Contracts With Customers - Change in Deferred Revenue and Accumulated Deficit (Details) - USD ($)
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Deferred revenue   $ 726,061  
Accumulated deficit $ (327,346,921) (320,608,968) $ (319,908,968)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Deferred revenue     26,061
Accumulated deficit     $ (319,908,968)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Deferred revenue   700,000  
Accumulated deficit   $ (700,000)