Note 11 - Stock-Based Compensation - Options Outstanding and Vested (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Options Outstanding (in shares) | shares	303
Weighted Average Remaining Contractual Life (Year)	4 years 7 days
Weighted Average Exercise Price (in dollars per share)	$ 19,360.30
Number Exercisable (in shares) | shares	303
Weighted Average Exercise Price, options vested (in dollars per share)	$ 19,360.30
Exercise Price Range 1 [Member]
Exercise Price, Upper Limit (in dollars per share)	$ 334.00
Options Outstanding (in shares) | shares	155
Weighted Average Remaining Contractual Life (Year)	5 years 5 months 8 days
Weighted Average Exercise Price (in dollars per share)	$ 334.00
Number Exercisable (in shares) | shares	155
Weighted Average Exercise Price, options vested (in dollars per share)	$ 334.00
Exercise Price Range 2 [Member]
Exercise Price, Upper Limit (in dollars per share)	$ 28,400.00
Options Outstanding (in shares) | shares	31
Weighted Average Remaining Contractual Life (Year)	4 years 2 months 4 days
Weighted Average Exercise Price (in dollars per share)	$ 17,323.87
Number Exercisable (in shares) | shares	31
Weighted Average Exercise Price, options vested (in dollars per share)	$ 17,323.87
Exercise Price, Lower Limit (in dollars per share)	16,400.00
Exercise Price Range 3 [Member]
Exercise Price, Upper Limit (in dollars per share)	$ 36,000.00
Options Outstanding (in shares) | shares	103
Weighted Average Remaining Contractual Life (Year)	2 years
Weighted Average Exercise Price (in dollars per share)	$ 36,000.00
Number Exercisable (in shares) | shares	103
Weighted Average Exercise Price, options vested (in dollars per share)	$ 36,000.00
Exercise Price Range 4 [Member]
Exercise Price, Upper Limit (in dollars per share)	$ 162,000.00
Options Outstanding (in shares) | shares	14
Weighted Average Remaining Contractual Life (Year)	2 years 10 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 112,097.14
Number Exercisable (in shares) | shares	14
Weighted Average Exercise Price, options vested (in dollars per share)	$ 112,097.14
Exercise Price, Lower Limit (in dollars per share)	$ 103,680.00