Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset		$ 9,725,871
Operating Lease, Liability, Total		9,817,505
Cumulative Effect on Retained Earnings, Net of Tax, Total		$ (73,126)
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset	$ 9,700,000
Operating Lease, Liability, Total	9,800,000
Cumulative Effect on Retained Earnings, Net of Tax, Total	$ 100,000