Note 11 - Accrued Expenses (Details Textual) - USD ($) $ in Millions	Mar. 08, 2018	Dec. 31, 2018
Recall Payable		$ 0.1
Former Chief Executive Officer [Member]
Severance Benefit, For A One Year Post Retirement Consulting Agreement	$ 0.3
Severance Benefit Following Retirement	$ 1.7
Severance Benefit Following Retirement, Term	1 year 180 days