Note 8 - Goodwill and Intangible Assets (Details Textual)		3 Months Ended		12 Months Ended
	Nov. 06, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)
Number of Reporting Units				1
Disposal Group, Including Discontinued Operation, Goodwill						$ 1,500,000
Goodwill, Ending Balance		$ 2,483,000	$ 2,483,000	$ 2,483,000	$ 2,483,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				9 years 292 days
Amortization of Intangible Assets, Total				$ 21,000	$ 93,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		21,000		21,000
Goodwill, Impairment Loss		0
Finite-Lived Intangible Assets, Amortization Expense, Year Two		$ 21,000		$ 21,000
Immunetics Intangibles [Member]
Impairment of Intangible Assets, Finite-lived			$ 879,000
Quest [Member]
Proceeds from Divestiture of Businesses	$ 170,000,000