Note 4 - Income Taxes - Reconciliation Between the Statutory Federal Income Tax Rate and the Company's Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Federal statutory rate	21.00%	34.00%
State taxes	8.20%	6.10%
Stock compensation	(0.50%)	7.60%
Nondeductible lobbying expenses	3.80%	3.20%
Other nondeductible/nontaxable items	1.20%	2.20%
Other, net	(0.20%)	(4.40%)
Effective tax rate	33.50%	48.70%