Note 1 - Organization and Summary of Significant Accounting Policies (Details) (USD $)
Share data in Millions, unless otherwise specified
1 Months Ended 12 Months Ended 0 Months Ended
Jul. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Nov. 03, 2014
Oct. 03, 2014
Dec. 31, 2011
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]                
Payments to Acquire Businesses, Gross   $ 52,509,000            
Inventory Valuation Reserves   1,949,000 1,479,000          
Capital Lease Obligations, Current   142,000            
Goodwill, Impairment Loss   0 0 0        
Product Warranty Accrual   110,000 40,000 40,000       40,000
Number of Integrated Circuits Shipped to Customer         4,000      
Additional Warranty       750,000        
Product Warranty Accrual, Payments 1,750,000 9,000            
Research and Development Expense, Adjustments   10,250,000 1,000,000 2,484,000        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments   0            
Number of Reportable Segments   1            
Field Installation Repair and Replacement [Member]                
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]                
Loss Contingency, Damages Sought, Value           4,000,000    
Cortina Systems, Inc. [Member]                
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]                
Payments to Acquire Businesses, Gross             $ 52,509,000  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)             5.3  
Minimum [Member]                
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life   5 years            
Product Warranty Term     1 year          
Maximum [Member]                
Note 1 - Organization and Summary of Significant Accounting Policies (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life   10 years            
Product Warranty Term     2 years