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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Oct. 01, 2018 USD ($)	Sep. 30, 2016 USD ($)
Number of Wholly Owned Subsidiaries	3
Number of Additional Inactive Subsidiaries	2
Investments, Typical Final Maturity Maximum	3 years
Investments, Typical Portfolio Weighted Average Maturity		18 years
Restricted Cash and Cash Equivalents, Total	$ 742,983	$ 39,446
Deferred Revenue for Collection Issues	0	0
Allowance for Doubtful Accounts Receivable, Ending Balance	150,000	0
Inventory Obsolescence Write Down (Recoveries)	21,481	161,600
Capital Lease Obligations, Total	$ 0	0
Product Warranty Period	1 year
Cost of Revenue, Total	$ 13,567,076	10,035,577
Revenues, Total	26,306,790	20,314,178
Advertising Expense	28,092	42,232
Standard and Extended Product Warranty Accrual, Ending Balance	$ 99,216	104,518		$ 243,423
Number of Reportable Segments	2
Foreign Currency Transaction Loss, before Tax	$ 236,430
Shipping and Handling [Member]
Cost of Revenue, Total	291,994	148,862
Revenues, Total	$ 169,184	$ 124,141
Accounting Standards Update 2014-09 [Member] \| Subsequent Event [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 0
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years
Finite-Lived Intangible Asset, Useful Life	15 years
Customer Concentration Risk [Member] \| Customer 1 [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage	12.00%	31.00%
Customer Concentration Risk [Member] \| Customer 2 [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage	11.00%	22.00%
Customer Concentration Risk [Member] \| Customer 3 [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage		14.00%