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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 27, 2018
Nov. 03, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Rent Expense, Net, Total       $ 3.6 $ 5.1 $ 5.0
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals       $ 8.3    
Suit Against HMS Holdings Related to the Acquisition of Allied Management Group [Member]            
Loss Contingency, Damages Awarded, Value   $ 60.0        
Litigation Settlement, Amount Awarded to Other Party $ 20.0   $ 20.0