Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($)		3 Months Ended
	Mar. 28, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Stock Issued During Period, Shares, New Issues	609,636
Shares Issued, Price Per Share	$ 2.27
Proceeds from Issuance of Common Stock, Net	$ 1,213,000	$ 1,213,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance		2,872,000		$ 3,513,000
Working Capital		3,904,000
Retained Earnings (Accumulated Deficit), Ending Balance		(190,679,000)		$ (187,640,000)
Boyalife Investment Fund II, Inc. [Member] | Revolving Credit Facility [Member]
Long-term Line of Credit, Total		7,200,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 10,000,000