Note 22 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Revenues, Total	$ 76,003,000	$ 63,623,000	$ 49,341,000	$ 60,867,000	$ 53,460,000	$ 44,501,000	$ 48,861,000	$ 47,697,000	$ 249,834,478	$ 194,519,345
Operating (loss) income	5,616,000	1,465,000	(1,620,000)	2,604,000	1,005,000	552,000	476,000	2,213,000	8,064,705	4,245,523
Stockholders	$ 2,547,000	$ (2,715,000)	$ (1,321,000)	$ 2,829,000	$ 1,559,000	$ (672,000)	$ 422,000	$ 968,000	$ 1,339,995	$ 2,277,109
Basic Earnings (Loss) per share (in dollars per share)	$ 1.25	$ (1.34)	$ (0.65)	$ 1.38	$ 0.76	$ (0.33)	$ 0.21	$ 0.47	$ 0.66	$ 1.11
Diluted Earnings (Loss) per share (in dollars per share)	$ 1.25	$ (1.34)	$ (0.65)	$ 1.38	$ 0.76	$ (0.33)	$ 0.21	$ 0.47	$ 0.66	$ 1.11