Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jun. 19, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 31, 2012
Rights Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	19,500,000
Shares Issued, Price Per Share (in dollars per share)	$ 0.65
Privately Negotiated Transaction [Member] | Common Stock [Member]
Stock Repurchased During Period, Shares (in shares)		0	0	0	0
Stock Repurchase Program, Authorized Amount						$ 5
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			460,000	15,000	30,000
Restricted Stock [Member]
Stock Repurchased During Period, Shares (in shares)		0	0	0	0