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Note 12 - Stockholders' Equity - Change in Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance $ 4,802,335 $ 2,482,072 $ 2,834,345 $ 4,040,660 $ 2,482,072 $ 4,040,660
Share based compensation 11,237 11,258 7,500 45,897    
Expenses paid in connection with ESOUSA transaction       (5,000)    
Net income (loss) 1,251,111 290,422 (338,414) (1,378,026) 1,541,537 (1,716,441)
Comprehensive income (loss) - foreign currency translation 93,601 18,583 (65,990) 130,813 112,183 64,824
ESOUSA transaction   2,000,000 151,482      
Balance $ 6,158,284 $ 4,802,335 $ 2,588,923 $ 2,834,345 $ 6,158,284 $ 2,588,923
Common Stock [Member]            
Balance (in shares) 5,198,156 4,997,349 4,125,754 4,111,082 4,997,349 4,111,082
Balance $ 519.37 $ 499.28 $ 412.13 $ 410.66 $ 499.28 $ 410.66
Share based compensation (in shares) 1,029 807 4,054 14,672    
Share based compensation $ 0.10 $ 0.08 $ 0.41 $ 1.47    
Expenses paid in connection with ESOUSA transaction       0    
Net income (loss) 0 0 0    
Comprehensive income (loss) - foreign currency translation $ 0 $ 0 $ 0    
Stock Issued During Period, Shares, New Issues (in shares)   200,000 65,862      
ESOUSA transaction   $ 20.00 $ 6.59      
Balance (in shares) 5,199,185 5,198,156 4,195,670 4,125,754 5,199,185 4,195,670
Balance $ 519.47 $ 519.37 $ 419.13 $ 412.13 $ 519.47 $ 419.13
Additional Paid-in Capital [Member]            
Balance 191,711,341 189,700,103 185,337,965 185,297,069 189,700,103 185,297,069
Share based compensation 11,237 11,258 7,500 45,896    
Expenses paid in connection with ESOUSA transaction       (5,000)    
Net income (loss) 0 0 0    
Comprehensive income (loss) - foreign currency translation 0 0 0    
ESOUSA transaction   1,999,980 151,475      
Balance 191,722,577 191,711,341 185,496,940 185,337,965 191,722,577 185,496,940
AOCI Attributable to Parent [Member]            
Balance (2,240,827) (2,259,410) (2,143,374) (2,274,187) (2,259,410) (2,274,187)
Share based compensation 0 0 0    
Expenses paid in connection with ESOUSA transaction       0    
Net income (loss) 0 0 0    
Comprehensive income (loss) - foreign currency translation 93,601 18,583 (65,990) 130,813    
ESOUSA transaction   0 0      
Balance (2,147,227) (2,240,827) (2,209,364) (2,143,374) (2,147,227) (2,209,364)
Noncontrolling Interest [Member]            
Balance (281,193) (267,053) (243,227) (231,999) (267,053) (231,999)
Share based compensation 0 0 0    
Expenses paid in connection with ESOUSA transaction       0    
Net income (loss) (12,764) (14,140) (13,724) (11,228)    
Comprehensive income (loss) - foreign currency translation 0 0    
ESOUSA transaction   0 0      
Balance (293,957) (281,193) (256,951) (243,227) (293,957) (256,951)
Retained Earnings [Member]            
Balance (184,387,504) (184,692,067) (180,117,432) (178,750,634) (184,692,067) (178,750,634)
Share based compensation 0 0 0    
Expenses paid in connection with ESOUSA transaction       0    
Net income (loss) 1,263,876 304,562 (324,690) (1,366,798)    
Comprehensive income (loss) - foreign currency translation 0 0    
ESOUSA transaction   0 0      
Balance $ (183,123,628) $ (184,387,504) $ (180,442,122) $ (180,117,432) $ (183,123,628) $ (180,442,122)