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Note 9 - Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2018
Dec. 31, 2017
Note 9 - Income Taxes (Details) [Line Items]        
Accrued Income Taxes, Noncurrent     $ 3,351,652 $ 4,527,849
Deferred Tax Liabilities, Other     2,010,000 2,500,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries     $ 1,340,000 $ 2,030,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 21.00% 35.00%
Effective Income Tax Rate Reconciliation Tax Cut and Jobs Act     $ 30,055 $ 3,365,221
Income Tax (Expense) Benefit, Continuing Operations, Estimated One-time Transition Tax on Post-1986 Foreign Unremitting Earnings       3,270,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       90,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     324,000 90,000
Cumulative Effect on Retained Earnings, Tax     380,000  
State and Local Jurisdiction [Member]        
Note 9 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards     $ 2,810,000 $ 1,860,000
Bright Swallow International Group Limited [Member] | Foreign Tax Authority [Member]        
Note 9 - Income Taxes (Details) [Line Items]        
Effective Income Tax Rate Reconciliation, Percent     16.50%