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Note 11 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Federal and state net operating loss carryforwards     $ 805,865 $ 523,808
Foreign tax credit and other credits     469,408 592,993
Reserves and accruals     320,783 271,884
Unicap 263A adjustment     112,199 126,944
Other deferred tax assets     88,369 26,198
Foreign and VIE net operating loss carryforwards     566,765 569,147
Deferred Interest Expense     529,983
Total gross deferred tax assets     2,893,372 2,110,974
Deferred tax liabilities:        
Fixed assets and intangibles     (257,113) (273,746)
Deferred state income tax     (91,691) (103,055)
Total gross deferred tax liabilities     (348,804) (376,801)
Less: valuation allowance $ (2,409,474) $ (631,706) (2,409,474) (631,706)
Net deferred tax assets     $ 135,094 $ 1,102,467
Deferred Tax Asset Valuation Allowance        
Beginning Balance 631,706 45,000    
Additions charged (credited) to expense 1,777,768 586,706    
Balance at end of year $ 2,409,474 $ 631,706