Note 2 - Revenue Recognition (Details Textual) - USD ($)	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 55,118,297	$ 27,473,282	$ 25,907,571
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	12.00%
International Regions Excluding Central America and South America [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,400,000	2,900,000	3,100,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total	2,700,000	0	0
Contract with Customer, Liability, Total	$ 100,000	$ 0	$ 0

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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