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Note 2 - Acquisition (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 22, 2014
Jul. 22, 2014
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 30, 2014
Note 2 - Acquisition (Details) [Line Items]                
Business Combination, Contingent Consideration, Liability     $ 0   $ 0 $ 2,507,000    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         $ (2,507,000)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)         1,562,000 1,426,000 2,974,000  
Selling, General and Administrative Expenses [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         $ (2,500,000)      
Restricted Stock Units (RSUs) [Member] | Former Sensima Employees [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Stock Granted, Value, Share-based Compensation, Gross   $ 1,700,000            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)   40,000            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years            
Performance Share Units [Member] | Former Sensima Employees [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Stock Granted, Value, Share-based Compensation, Gross   $ 2,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)   47,000            
Maximum PSU Earn Out $ 8,000,000 $ 8,000,000            
Sensima [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired 100.00% 100.00%            
Escrow Deposit $ 1,200,000 $ 1,200,000            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 8,900,000 8,900,000           $ 8,900,000
Business Combination, Contingent Consideration, Liability 2,507,000 $ 2,507,000 0   $ 0     $ 2,500,000
Sensima [Member] | Selling, General and Administrative Expenses [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (2,500,000)          
Business Combination, Acquisition Related Costs $ 600,000              
Share-based Compensation Award, Tranche One [Member] | Sensima [Member] | Former Sensima Employees [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%              
Remaining Half of RSU Awards [Member] | Performance Share Units [Member] | Former Sensima Employees [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years              
Know-How And Developed Technologies [Member] | Minimum [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life         3 years      
Know-How And Developed Technologies [Member] | Minimum [Member] | Sensima [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life 3 years              
Know-How And Developed Technologies [Member] | Maximum [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life         5 years      
Know-How And Developed Technologies [Member] | Maximum [Member] | Sensima [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life 5 years              
In Process Research and Development [Member] | Sensima [Member]                
Note 2 - Acquisition (Details) [Line Items]                
Finite-Lived Intangible Asset, Useful Life       4 years