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Note 7 - Net Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Federal, state and foreign loss carryforwards | $ 1,850,000 | $ 3,862,000
Capital loss carryforward |  | 3,570,000
Deferred revenue | 68,000 | 71,000
Deferred Tax Assets, Tax Credit Carryforwards | 653,000 | 520,000
Other | (79,000) | 503,000
Total deferred tax asset | 2,492,000 | 8,526,000
Less valuation allowance | $ (2,492,000) | $ (8,526,000)

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