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Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 6,949,920 $ 6,987,596
Less - accumulated depreciation and amortization (4,711,489) (4,621,639)
Property, plant and equipment, net 2,238,431 2,365,957
Other Assets [Member]    
Property, plant and equipment, gross 3,678,647 3,678,647
Leasehold Improvements [Member]    
Property, plant and equipment, gross 2,420,028 2,420,028
Computer Equipment [Member]    
Property, plant and equipment, gross 473,386 511,062
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 377,859 $ 377,859