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Note 21 - Leases (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2019
USD ($)
Apr. 30, 2019
ft²
Feb. 28, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Operating Lease, Liability, Total   $ 1,544,000      
Operating Leases, Rent Expense, Total $ 800,000        
Headquarters [Member]          
Area of Real Estate Property (Square Foot) | ft²       21,189 30,506
Security Deposit   140,000   $ 140,000 $ 225,000
Offices, Taipei, Taiwan [Member]          
Area of Real Estate Property (Square Foot) | ft² 2,635   1,317    
Security Deposit   $ 14,000