Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Payroll expenses and tax payable	$ 123,000	$ 299,000
Commission and bonuses payable and general accrued liabilities	2,670,000	621,000
Accrued liabilities	$ 2,793,000	$ 920,000