Note 4 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate Reconciliation, Percent, Total	22.10%	(1.70%)	19.40%	9.10%
Income Tax Expense (Benefit) Related to Recapitalization		$ 1,100,000		$ 1,100,000
Increase (Decrease) in Income Tax Expense from Exercise of Options and Dividends Paid to Non-vested Shareholders	$ 800,000		$ 700,000
Increase (Decrease) in Income Tax Expense from Non-deductible Recapitalization Expenses			$ 154,000