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Note 14 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Domestic Tax Authority [Member]        
Operating Loss Carryforwards   $ 19,000    
Tax Credit Carryforward, Amount   $ 3,100    
State and Local Jurisdiction [Member] | Colorado Department of Revenue Taxation Division [Member] | Earliest Tax Year [Member]        
Income Tax Examination, Year under Examination   2009    
State and Local Jurisdiction [Member] | Colorado Department of Revenue Taxation Division [Member] | Latest Tax Year [Member]        
Income Tax Examination, Year under Examination   2013    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards   $ 34,000    
Tax Credit Carryforward, Amount   2,800    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   (100) $ (100) $ 100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   $ 100 $ 100  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount $ 2,500      
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ 5,210 $ 9 $ 954
Deferred Tax Liabilities, Undistributed Foreign Earnings   800    
Undistributed Earnings of Foreign Subsidiaries   2,300    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit   $ 4,500