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Note 18 - Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net revenues	$ 90,621	$ 85,008	$ 84,223	$ 69,568	$ 48,805	$ 49,064	$ 47,204	$ 44,746	$ 329,420,741	$ 189,818,932	$ 171,686,779
Gross Profit	25,736	20,494	21,347	16,944	16,423	16,638	15,645	14,348	84,520,629	63,053,634	52,057,809
Net income	$ 11,199	$ 3,439	$ 5,241	$ 2,446	$ 2,817	$ 4,741	$ 4,071	$ 4,438	$ 22,326,594	$ 16,067,154	$ 11,373,730
Basic (in dollars per share)	$ 1.06	$ 0.33	$ 0.50	$ 0.23	$ 0.27	$ 0.45	$ 0.39	$ 0.42	$ 2.12	$ 1.53	$ 1.04
Diluted (in dollars per share)	$ 1.04	$ 0.32	$ 0.49	$ 0.23	$ 0.26	$ 0.45	$ 0.38	$ 0.41	$ 2.07	$ 1.50	$ 1

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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