Note 11 - Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
United States federal tax at statutory rate, amount	$ (13,070)	$ (12,774)	$ (33,038)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State taxes (net of deferred benefit), amount	$ (2,205)	$ (1,768)	$ (4,778)
State taxes (net of deferred benefit), percent	3.50%	2.90%	3.00%
Nondeductible expenses, amount	$ (440)	$ 719	$ 709
Nondeductible expenses, percent	0.70%	(1.20%)	(0.50%)
Change in fair market value of contingent consideration, amount	$ (397)	$ 717	$ (2,342)
Change in fair market value of contingent consideration, percent	0.60%	(1.20%)	1.50%
Warrant remeasurment and financing costs, amount	$ 502	$ 82	$ (551)
Warrant remeasurment and financing costs, percent	(0.80%)	(0.10%)	0.40%
Research & Development, amount	$ (705)	$ (542)	$ (743)
Research & Development, percent	1.10%	0.90%	0.50%
Change in unrecognized tax benefits, amount	$ 141	$ (1,512)	$ 149
Change in unrecognized tax benefits, percent	(0.20%)	2.50%	(0.10%)
Foreign tax rate differential, amount	$ 1,911	$ 1,589	$ 2,590
Foreign tax rate differential, percent	(3.10%)	(2.60%)	(1.60%)
Goodwill and investment impairments, amount	$ 0	$ 0	$ (6,638)
Goodwill and investment impairments, percent	0.00%	0.00%	4.20%
Adjustment for 382 Limitations, amount	$ 0	$ 67,255	$ 0
Adjustment for 382 Limitations, percent	0.00%	(110.60%)	0.00%
True-up to Stock Compensation - Cancellations, amount	$ 2,832	$ 0	$ 0
True-up to Stock Compensation - Cancellations, percent	(4.60%)	0.00%	0.00%
Change in enacted tax rates and other, net, amount	$ 731	$ 533	$ (253)
Change in enacted tax rates and other, net, percent	(1.00%)	(0.90%)	0.20%
Change in valuation allowance, amount	$ 10,925	$ (55,815)	$ 41,771
Change in valuation allowance, percent	(17.60%)	91.80%	26.60%
Total income tax expense (benefit)	$ 225	$ (1,516)	$ (3,124)
Income tax expense (benefit), percent	(0.40%)	2.50%	2.00%