Note 11 - Concentrations (Details Textual) - USD ($)	6 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounts Receivable, Net, Current	$ 1,687,000		$ 3,393,000	$ 3,169,000
Revenue from Related Parties	1,679,000		308,000
Revenue, Net	6,013,000	$ 7,772,000	14,525,000	11,929,000
Distributor 2 [Member]
Accounts Receivable, Net, Current	464,000		304,000	320,000
Distributor 1 [Member]
Accounts Receivable, Net, Current			1,388,000	901,000
Revenue, Net	480,000		2,842,000	2,797,000
Customer 1 [Member]
Accounts Receivable, Net, Current	172,000		259,000	620,000
Revenue, Net	$ 560,000		$ 3,263,000	$ 2,475,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Distributor 2 [Member]
Concentration Risk, Percentage	18.00%		8.00%	10.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Distributor 1 [Member]
Concentration Risk, Percentage			38.00%	28.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer 1 [Member]
Concentration Risk, Percentage	7.00%		7.00%	19.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Distributor 1 [Member]
Concentration Risk, Percentage	8.00%		20.00%	23.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Customer 1 [Member]
Concentration Risk, Percentage	9.00%		22.00%	21.00%
Supplier Concentration Risk [Member] \| Cost of Goods, Total [Member] \| Supplier 1 [Member]
Concentration Risk, Percentage	61.00%		64.00%	65.00%
Supplier Concentration Risk [Member] \| Cost of Goods, Total [Member] \| Supplier 2 [Member]
Concentration Risk, Percentage			20.00%	21.00%
Related Distributor [Member]
Accounts Receivable, Related Parties	$ 862,000		$ 308,000
Revenue from Related Parties	$ 1,679,000		$ 308,000
Related Distributor [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage	34.00%		8.00%
Related Distributor [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage	28.00%		2.00%

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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