Note 5 - Government Relief Funding (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 11, 2020
Employee Retention Tax Credit			$ 3.2
Employee Retention Tax Credit, Amount Received	$ 1.6
Employee Retention Tax Credit, Amount Expected to Be Refunded	$ 1.6		$ 1.6
Payroll Protection Program Term Note [Member]
Debt Instrument, Face Amount					$ 6.9
Debt Instrument, Interest Rate, Stated Percentage					1.00%
Payroll Protection Program Term Note [Member] | Other Income [Member]
Government Relief Funding, Amortization		$ 6.9		$ 6.9