Note 23 - Geographical Information - Revenue by Geographic Areas (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
UNITED STATES
Revenues, Total									211,816,770	175,727,524
Non-US [Member]
Revenues, Total									$ 38,017,708	$ 18,791,821