Note 6 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jan. 01, 2021
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 2.4	$ (1.3)
Income Tax Expense (Benefit), Continuing Operations, Adjustment to Per Diluted Share		$ 0.11	$ 0.06
Open Tax Year				2016 2017 2018
Forecast [Member]
Unrecognized Deferred Tax Asset that Would Impact Income Tax Expense (Benefit)					$ 0.2
State and Local Jurisdiction [Member] | Kentucky Department of Revenue [Member]
Franchise Tax as Percent of Net Capital	1.10%
Average Franchise Tax Over Two Year-end Periods	$ 2.5
State Corporate Income Tax as Percent of Earnings Before Income Tax Expense	5.00%