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Note 2 - Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
[1]
Jul. 01, 2018
Dec. 31, 2017
Goodwill $ 26,574 $ 20,109 $ 20,322 $ 20,458
Southwest Electronic Energy Corporation [Member]        
Cash 942      
Accounts receivable 3,621      
Inventories 4,685      
Prepaid expenses and other current assets 431      
Property, equipment and improvements 9,177      
Goodwill 6,474      
Other intangible assets 3,649      
Accounts payable (1,060)      
Other current liabilities (718)      
Deferred tax liability, net (1,011)      
Net assets acquired $ 26,190      
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Prior period balances have been adjusted for the effects of the new standard. See Note 1 for further information.