Note 20 - Geographical Information - Revenue by Geographic Areas (Details) - USD ($)	3 Months Ended												12 Months Ended
	Mar. 31, 2016	[1]	Dec. 31, 2015	[1]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	[1]	Dec. 31, 2014	[1]	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016		Mar. 31, 2015
Operating revenues	$ 34,581,000		$ 46,619,000		$ 44,654,000	$ 22,359,000	$ 24,885,000		$ 30,893,000		$ 34,625,000	$ 21,779,000	$ 148,211,938	[2]	$ 112,181,158
UNITED STATES
Operating revenues													141,010,279		103,642,292
Non-US [Member]
Operating revenues													$ 7,201,659		$ 8,538,866

[1] Results of operations for the third and fourth quarter of 2016 have been restated. See Note 1A.

[2] The Consolidated Statement of Comprehensive Income for the year ended March 31, 2016 has been restated. See Note 1A.