Note 2 - Revenue Recognition (Details Textual) - USD ($)	3 Months Ended		6 Months Ended				18 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2020	Sep. 30, 2019
Revenue from Contract with Customer, Including Assessed Tax	$ 11,959,125	$ 12,889,940	$ 25,921,483	$ 25,921,483	$ 19,700,037	$ 19,700,037
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Largest Customer [Member]
Concentration Risk, Percentage			10.00%
Wireless Sales in Central America, South America, and International Regions [Member]
Revenue from Contract with Customer, Including Assessed Tax	400,000	$ 500,000	$ 800,000		$ 1,000,000
International Regions Excluding Central America and South America [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Total	1,700,000		1,700,000	1,700,000			$ 1,700,000	$ 2,700,000
Contract with Customer, Liability, Total	$ 1,000,000		$ 1,000,000	$ 1,000,000			1,000,000	$ 100,000
Contract with Customer, Liability, Revenue Recognized							$ 100,000