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Note 17 - Supplementary Financial Information (Unaudited) (Details) - Quarterly Results of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Results of Operations [Abstract]                      
Total revenue $ 54,753us-gaap_Revenues [1] $ 36,278us-gaap_Revenues $ 33,922us-gaap_Revenues $ 31,189us-gaap_Revenues $ 29,130us-gaap_Revenues $ 26,611us-gaap_Revenues $ 24,339us-gaap_Revenues $ 22,584us-gaap_Revenues $ 156,142us-gaap_Revenues $ 102,664us-gaap_Revenues $ 91,206us-gaap_Revenues
Gross profit 20,627us-gaap_GrossProfit [1] 23,275us-gaap_GrossProfit 21,626us-gaap_GrossProfit 20,126us-gaap_GrossProfit 19,016us-gaap_GrossProfit 16,815us-gaap_GrossProfit 15,446us-gaap_GrossProfit 14,292us-gaap_GrossProfit 85,654us-gaap_GrossProfit 65,569us-gaap_GrossProfit 58,522us-gaap_GrossProfit
Net income (loss) $ (17,390)us-gaap_NetIncomeLoss [1] $ (6,857)us-gaap_NetIncomeLoss $ 2,634us-gaap_NetIncomeLoss $ (995)us-gaap_NetIncomeLoss $ (1,273)us-gaap_NetIncomeLoss $ (2,760)us-gaap_NetIncomeLoss $ (1,474)us-gaap_NetIncomeLoss $ (7,671)us-gaap_NetIncomeLoss $ (22,608)us-gaap_NetIncomeLoss $ (13,178)us-gaap_NetIncomeLoss $ (20,691)us-gaap_NetIncomeLoss
Basic earnings per share (in Dollars per share) $ (0.47)us-gaap_EarningsPerShareBasic [1] $ (0.22)us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic $ (0.09)us-gaap_EarningsPerShareBasic $ (0.05)us-gaap_EarningsPerShareBasic $ (0.27)us-gaap_EarningsPerShareBasic $ (0.69)us-gaap_EarningsPerShareBasic $ (0.45)us-gaap_EarningsPerShareBasic $ (0.73)us-gaap_EarningsPerShareBasic
Diluted earnings per share (in Dollars per share) $ (0.47)us-gaap_EarningsPerShareDiluted [1] $ (0.22)us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted $ (0.09)us-gaap_EarningsPerShareDiluted $ (0.05)us-gaap_EarningsPerShareDiluted $ (0.27)us-gaap_EarningsPerShareDiluted $ (0.69)us-gaap_EarningsPerShareDiluted $ (0.45)us-gaap_EarningsPerShareDiluted $ (0.73)us-gaap_EarningsPerShareDiluted
[1] On October 3, 2014, we completed the acquisition of Cortina, including its high-speed interconnect and optical transport product lines. The results of operations of Cortina and estimated fair value of assets acquired and liabilities assumed were included in our financial statements from the acquisition date. This acquisition resulted in a significant change in our statement of operations in 2014 which includes increase cost of goods sold resulting from the step-up inventory acquired from Cortina and amortization of acquired intangibles.