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

Note 4 - Stockholders' Equity - Stock Options by Exercise Price Range (Details)

v3.19.2
Note 4 - Stockholders' Equity - Stock Options by Exercise Price Range (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of options outstanding (in shares) 121,633 81,633  
Weighted- average exercise price (in dollars per share) $ 147.40 $ 215.60 $ 395.20
Weighted- average remaining contractual life (Year) 6 years 146 days 5 years 36 days 4 years 255 days
Aggregate intrinsic value $ 19,040 $ 108,000
Range One [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 8 $ 20  
Range of exercise prices, upper limit (in dollars per share) $ 10 $ 70  
Number of options outstanding (in shares) 40,000 29,432  
Weighted- average exercise price (in dollars per share) $ 8.60    
Weighted- average remaining contractual life (Year) 9 years 255 days 7 years 109 days  
Aggregate intrinsic value $ 19,040  
Range Two [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 20 $ 70.20  
Range of exercise prices, upper limit (in dollars per share) $ 70 $ 260  
Number of options outstanding (in shares) 29,432 26,612  
Weighted- average exercise price (in dollars per share) $ 23    
Weighted- average remaining contractual life (Year) 7 years 36 days 4 years 109 days  
Aggregate intrinsic value  
Range Three [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 70.20 $ 260.20  
Range of exercise prices, upper limit (in dollars per share) $ 260 $ 520  
Number of options outstanding (in shares) 26,612 17,189  
Weighted- average exercise price (in dollars per share) $ 195.20    
Weighted- average remaining contractual life (Year) 4 years 36 days 3 years 36 days  
Aggregate intrinsic value  
Range Four [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 260.20 $ 520.20  
Range of exercise prices, upper limit (in dollars per share) $ 520 $ 780  
Number of options outstanding (in shares) 17,189 3,275  
Weighted- average exercise price (in dollars per share) $ 295.80    
Weighted- average remaining contractual life (Year) 2 years 292 days 2 years 182 days  
Aggregate intrinsic value  
Range Five [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 520.20 $ 780.20  
Range of exercise prices, upper limit (in dollars per share) $ 780 $ 1,120  
Number of options outstanding (in shares) 3,275 5,125  
Weighted- average exercise price (in dollars per share) $ 617    
Weighted- average remaining contractual life (Year) 2 years 73 days 4 years 219 days  
Aggregate intrinsic value  
Range Six [Member]      
Range of exercise prices, lower limit (in dollars per share) $ 780.20    
Range of exercise prices, upper limit (in dollars per share) $ 1,120    
Number of options outstanding (in shares) 5,125    
Weighted- average exercise price (in dollars per share) $ 900.60    
Weighted- average remaining contractual life (Year) 4 years 109 days    
Aggregate intrinsic value