Note 17 - Quarterly Data (Unaudited) - Summary of Quarterly 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, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Net Sales	$ 11,754,219	$ 10,892,868	$ 7,220,626	$ 3,346,315	$ 2,356,926	$ 2,692,040	$ 1,530,244	$ 1,046,624	$ 1,376,872	$ 23,816,735	$ 6,645,780	$ 5,852,924
Gross Profit	3,225,832	3,034,379	3,029,146	1,377,514	583,238	561,720	760,244	352,080	636,351	8,024,277	2,310,965	2,684,621
Net Income (Loss)	$ 510,262	$ 567,439	$ 941,523	$ 213,140	$ (313,706)	$ 5,152,576	$ (8,095)	$ (464,444)	$ (47,189)	$ 1,408,396	$ 4,632,848	$ (122,377)
Basic (in dollars per share)	$ 0.18	$ 0.20	$ 0.33	$ 0.07	$ (0.11)	$ 1.81	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.49	$ 2.38	$ (0.07)
Diluted (in dollars per share)	$ 0.16	$ 0.18	$ 0.31	$ 0.07	$ (0.11)	$ 1.77	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.46	$ 2.36	$ (0.07)