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Note 5 - Discontinued Operations (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 22, 2018
Dec. 31, 2019
Dec. 31, 2018
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total   $ 1,002 $ 15,754
Denville [Member]      
Disposal Group, Including Discontinued Operation, Consideration $ 20,000    
Earn Out Provision of Discontinued Operations 3,000    
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total 15,700    
Maximum Contingent Consideration Based on 2018 Operating Results 2,000    
Maximum Contingent Consideration Based on 2019 Operating Results $ 1,000    
Escrow Amount, Released   $ 1,000