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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 |  |

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