Note 5 - Significant Risks and Uncertainties (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	2	2	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Contract Manufacturing [Member]
Number of Major Customers	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage	93.00%	93.00%	92.00%	91.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Major Customer 1 [Member]
Concentration Risk, Percentage			68.00%	70.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Major Customer 1 [Member] | Contract Manufacturing [Member]
Concentration Risk, Percentage	70.00%	75.00%
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] | Major Customer 2 [Member] | Contract Manufacturing [Member]
Concentration Risk, Percentage	26.00%	20.00%
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			89.00%		88.00%
Number of Employees, Geographic Area [Member] | Unionized Employees Concentration Risk [Member]
Concentration Risk, Percentage			73.00%