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Note 8 - Effective Income Tax Rate Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Taxes computed at the federal statutory rate $ 2,722,000 $ (12,812,000) $ 3,792,000
State income tax, net 70,000 4,000
Prior year true-up 325,000 44,000 $ 190,000
Research and development tax credit $ (177,000) (140,000)
Reduction in domestic production activity 893,000
AMT credit carryforward (584,000)
Permanent differences $ 51,000 122,000 $ (565,000)
Provision for (benefit from) income taxes $ 2,991,000 $ (12,473,000) $ 3,417,000