Note 6 - Goodwill and Intangible Assets (Details Textual) $ in Millions	Mar. 31, 2019 USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 0.2
Finite-Lived Intangible Assets, Amortization Expense, Year Two	0.6
Finite-Lived Intangible Assets, Amortization Expense, Year Three	0.6
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0.5
Finite-Lived Intangible Assets, Amortization Expense, Year Five	0.5
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 2.1