Note 11 - Concentrations (Details Textual) - USD ($)	6 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2017
Accounts Receivable, Net, Current, Total	$ 1,687,000	$ 1,495,000	$ 1,687,000
Revenue from Contract with Customer, Including Assessed Tax	4,334,000	9,003,000		$ 14,217,000
Revenue from Related Parties	1,679,000	669,000		308,000
Related Distributor [Member]
Accounts Receivable, Net, Current, Total	862,000	0	$ 862,000
Revenue from Related Parties	$ 1,679,000	$ 664,000		$ 308,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Related Distributor [Member]
Concentration Risk, Percentage		34.00%	34.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Related Distributor [Member]
Concentration Risk, Percentage	28.00%	7.00%		2.00%
Supplier Concentration Risk [Member] \| Cost of Goods, Total [Member] \| Supplier 1 [Member]
Concentration Risk, Percentage	61.00%	43.00%		64.00%
Supplier Concentration Risk [Member] \| Cost of Goods, Total [Member] \| Supplier 2 [Member]
Concentration Risk, Percentage		14.00%		20.00%
Customer 1 [Member]
Accounts Receivable, Related Parties	$ 172,000	$ 494,000	$ 172,000
Revenue from Contract with Customer, Including Assessed Tax	$ 560,000	$ 2,120,000		$ 3,263,000
Customer 1 [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage		33.00%	7.00%
Customer 1 [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage	9.00%	22.00%		22.00%
Distributor 1 [Member]
Accounts Receivable, Related Parties	$ 12,000	$ 229,000	$ 12,000
Revenue from Contract with Customer, Including Assessed Tax	$ 480,000	$ 461,000		$ 2,842,000
Distributor 1 [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage		15.00%
Distributor 1 [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage	8.00%	5.00%		20.00%
Distributor 3 [Member]
Accounts Receivable, Related Parties		$ 220,000
Accounts Receivable, Net, Current, Total	$ 464,000		$ 464,000
Distributor 3 [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage	18.00%	15.00%
Distributor [Member]
Revenue from Related Parties	$ 520,000	$ 861,000		$ 1,048,000
Distributor [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage	9.00%	9.00%		7.00%

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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