Note I - Net (Loss) Income Per Share - Anti-dilutive Securities (Details) - shares		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive securities (in shares)		19,759,239	37,480,644	19,759,239	41,347,106
Convertible Debt Securities [Member]
Antidilutive securities (in shares)		1,275,971	1,192,918	1,275,971	1,192,918
2021 Notes [Member]
Antidilutive securities (in shares)	[1]		31,166,835		31,166,835
January 2020 Note [Member]
Antidilutive securities (in shares)		544,599		544,599
The 2019 Notes [Member]
Antidilutive securities (in shares)		9,844,933		9,844,933
Share-based Payment Arrangement [Member]
Antidilutive securities (in shares)		5,670,659	4,620,891	5,670,659	4,620,891
Warrants to Purchase Common Stock [Member]
Antidilutive securities (in shares)		2,423,077	500,000	2,423,077	2,423,077
Series A Convertible Preferred Stock [Member]
Antidilutive securities (in shares)					1,112,334
Series B-1 Convertible Preferred Stock [Member]
Antidilutive securities (in shares)					831,051

[1] Inclusive of 28,439,015 shares of Common Stock issuable (i) in exchange of the Optional Exchange Principal Amount, or (ii) upon conversion of the Series B-2 Preferred Stock issuable in exchange of the Optional Exchange Principal Amount.