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Note 15 - Stock-based Compensation - Summary of Stock Options Activity (Details) - Share-based Payment Arrangement, Option [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Options Outstanding, Number of shares (in shares) 1,121,332  
Options Outstanding, Weighted–average exercise price (in dollars per share) $ 1.52  
Options outstanding, Weighted–average Grant–date fair value (in dollars per share) $ 0.99 $ 0.99
Options outstanding, Aggregate intrinsic value [1]
Options granted, Number of shares (in shares)  
Options granted, Weighted–average exercise price (in dollars per share)  
Exercised, Number of shares (in shares)  
Exercised, Weighted–average exercise price (in dollars per share)  
Cancelled/forfeited, Number of shares (in shares)  
Cancelled/forfeited, Weighted–average exercise price (in dollars per share)  
Options Outstanding, Number of shares (in shares) 1,121,332 1,121,332
Options Outstanding, Weighted–average exercise price (in dollars per share) $ 1.52 $ 1.52
Options outstanding, Weighted–average remaining contractual term (Year) 5 years 222 days  
Vested and exercisable, Number of shares (in shares) 1,121,332  
Vested and exercisable, Weighted–average exercise price (in dollars per share) $ 1.52  
Vested and exercisable, Weighted–average remaining contractual term (Year) 5 years 222 days  
Vested and exercisable, Weighted–average Grant–date fair value (in dollars per share) $ 0.99  
Vested and exercisable, Aggregate intrinsic value [1]  
Vested and expected to vest thereafter, Number of shares (in shares) 1,121,332  
Vested and expected to vest thereafter, Weighted-average exercise price (in dollars per share) $ 1.52  
Vested and expected to vest thereafter, Weighted–average remaining contractual term (Year) 5 years 222 days  
Vested and expected to vest thereafter, Weighted–average Grant–date fair value (in dollars per share) $ 0.99  
Vested and expected to vest thereafter, Aggregate intrinsic value [1]  
[1] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $0.18 of the Company's common stock on June 30, 2019 (to the extent that the closing stock price exceeds the exercise price).