Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Dec. 31, 2015	Jun. 30, 2015
BARDA [Member]
Current liabilities:
Contract payable (BARDA)		$ 1,000,000
Cash and cash equivalents	$ 39,000,000	44,700,000
Short-term investments	13,000,000	12,900,000
Accounts receivable, net of allowance	5,100,000	12,600,000
Prepaid and other current assets	1,500,000	600,000
Total current assets	58,600,000	70,800,000
Long-term investments	5,200,000	7,900,000
Property and equipment, net	$ 400,000	200,000
Deferred tax asset		500,000
Total non-current assets	$ 5,600,000	8,600,000
Total assets	64,200,000	79,400,000
Accounts payable	1,300,000	1,900,000
Accrued expenses	4,300,000	5,400,000
Short term note payable	$ 400,000	200,000
Deferred tax liability		500,000
Total current liabilities	$ 6,000,000	9,000,000
Non-current liabilities:
Long-term note payable, net of current portion	500,000	800,000
Other liabilities, net of current portion	200,000	100,000
Total liabilities	$ 6,700,000	$ 9,900,000
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.10 par value: 200,000,000 shares authorized; 38,636,946 and 38,609,086 shares issued and outstanding at December 31, 2015 and June 30, 2015, respectively	$ 3,900,000	$ 3,900,000
Additional paid-in capital	156,800,000	155,600,000
Accumulated other comprehensive income	18,900,000	18,900,000
Accumulated deficit	(122,100,000)	(108,900,000)
Total stockholders’ equity	57,500,000	69,500,000
Total liabilities and stockholders’ equity	$ 64,200,000	$ 79,400,000