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Note 3 - Supplemental Balance Sheet Information (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance $ 25,934 $ 18,330 $ 10,706
Revenues, Total [1] 87,190 85,531  
Construction in Progress, Gross 2,870 5,136  
Depreciation, Total $ 1,972 2,005  
Number of Reporting Units 4    
Goodwill, Impairment Loss $ 0 $ 0  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 362    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 349    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 330    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 315    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 312    
Grant [Member]      
Revenues, Total $ 97    
[1] Sales classified to U.S. include shipments to U.S.-based prime contractors which in some cases may serve non-U.S. projects