General form of registration statement for all companies including face-amount certificate companies

Note 3 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value for a Recurring Basis (Details)

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Note 3 - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value for a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of liabilities $ 923,849 $ 583,734 $ 3,852,882
Stock Purchase Warrants [Member]      
Liability classified stock purchase warrants 923,849 583,734 3,852,882
Fair Value, Inputs, Level 1 [Member]      
Fair value of liabilities
Fair Value, Inputs, Level 1 [Member] | Stock Purchase Warrants [Member]      
Liability classified stock purchase warrants
Fair Value, Inputs, Level 2 [Member]      
Fair value of liabilities
Fair Value, Inputs, Level 2 [Member] | Stock Purchase Warrants [Member]      
Liability classified stock purchase warrants
Fair Value, Inputs, Level 3 [Member]      
Fair value of liabilities 923,849 583,734 3,852,882
Fair Value, Inputs, Level 3 [Member] | Stock Purchase Warrants [Member]      
Liability classified stock purchase warrants $ 923,849 $ 583,734 $ 3,852,882