Note 14 - Restructuring Costs - Restructuring Liabilities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cumulative cost incurred	$ 4,071,000		$ 4,071,000
Balance			3,648,000
Restructuring costs	(952,000)		(849,000)
Payments and settlements			(2,785,000)
Balance	14,000		14,000
Contract Termination [Member]
Cumulative cost incurred	2,252,000		2,252,000
Balance			3,223,000
Restructuring costs			(971,000)
Payments and settlements			(2,252,000)
Balance
Employee Severance [Member]
Cumulative cost incurred	368,000		368,000
Balance			368,000
Restructuring costs
Payments and settlements			(368,000)
Balance
Impairment Charges [Member]
Cumulative cost incurred	1,272,000		1,272,000
Balance
Restructuring costs
Payments and settlements
Balance
Other Restructuring [Member]
Cumulative cost incurred	179,000		179,000
Balance			57,000
Restructuring costs			122,000
Payments and settlements			(165,000)
Balance	$ 14,000		$ 14,000