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Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Property, plant and equipment, gross $ 6,987,596 $ 6,274,944
Less-accumulated depreciation (4,621,639) (4,170,954)
Property, plant and equipment, net 2,365,957 2,103,990
Other Assets [Member]    
Operating lease right-of-use asset 3,678,647 2,944,932
Leasehold Improvements [Member]    
Property, plant and equipment, gross 2,420,028 2,420,028
Computer Equipment [Member]    
Property, plant and equipment, gross 511,062 532,125
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 377,859 $ 377,859