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Note 16 - Shareholders' Equity - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details)
 12 Months Ended
Dec. 31, 2018
EUR (€)
€ / shares
shares
Outstanding options - Number (in shares) | shares 1,347,600
Outstanding options - Weighted average remaining contractual life (Day) 5 days
Outstanding options - Weighted average exercise price (in EUR per share) € 2.61
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 772,600 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 2.44 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Exercise price, Lower range (in EUR per share) € 1.88
Exercise price, Upper range (in EUR per share) € 3.22
Range 1 [Member]  
Outstanding options - Number (in shares) | shares 505,000
Outstanding options - Weighted average remaining contractual life (Day) 7 days
Outstanding options - Weighted average exercise price (in EUR per share) € 3.22
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 252,500 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 3.22 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Range 2 [Member]  
Outstanding options - Number (in shares) | shares 165,000
Outstanding options - Weighted average remaining contractual life (Day) 9 days
Outstanding options - Weighted average exercise price (in EUR per share) € 2.65
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares [2]
Exercisable options - Weighted average exercise price (in EUR per share) [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Range 3 [Member]  
Outstanding options - Number (in shares) | shares 210,000
Outstanding options - Weighted average remaining contractual life (Day) 8 days
Outstanding options - Weighted average exercise price (in EUR per share) € 2.39
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 52,500 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 2.39 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Range 4 [member]  
Outstanding options - Number (in shares) | shares 120,100
Outstanding options - Weighted average remaining contractual life (Day) 1 day
Outstanding options - Weighted average exercise price (in EUR per share) € 2.38
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 120,100 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 2.38 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Range 5 [Member]  
Outstanding options - Number (in shares) | shares 297,500
Outstanding options - Weighted average remaining contractual life (Day) 4 days
Outstanding options - Weighted average exercise price (in EUR per share) € 1.91
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 2,975,000 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 1.91 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
Range 6 [Member]  
Outstanding options - Number (in shares) | shares 50,000
Outstanding options - Weighted average remaining contractual life (Day) 1 day
Outstanding options - Weighted average exercise price (in EUR per share) € 1.88
Outstanding options - Aggregate intrinsic value | € [1]
Exercisable options - Number (in shares) | shares 50,000 [2]
Exercisable options - Weighted average exercise price (in EUR per share) € 1.88 [2]
Exercisable options - Aggregate intrinsic value | € [1],[2]
[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the Company's closing stock price of $1.85 at December 31, 2018, which would have been received by the option holders had all in-the-money option holders exercised their options as of that date.
[2] Fully vested options are all exercisable options