Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Payroll expenses and tax payable	$ 269,000	$ 232,000
Commission and bonuses payable and general accrued liabilities	1,073,000	1,333,000
	$ 1,342,000	$ 1,565,000