Note 5 - Significant Risks and Uncertainties (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	91.00%	92.00%
Number of Major Customers	2	2	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Major Customer 1 [Member]
Concentration Risk, Percentage			67.00%	71.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Major Customer 2 [Member]
Concentration Risk, Percentage			27.00%	24.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage			92.00%	92.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Contract Manufacturing [Member]
Number of Major Customers	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Contract Manufacturing [Member] | Major Customer 1 [Member]
Concentration Risk, Percentage	64.00%	72.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Contract Manufacturing [Member] | Major Customer 2 [Member]
Concentration Risk, Percentage	26.00%	22.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers			2		2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage			82.00%		88.00%
Number of Employees, Geographic Area [Member] | Unionized Employees Concentration Risk [Member]
Concentration Risk, Percentage			71.00%