4. Per Share Data (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Notes to Financial Statements
Net income (loss)	$ 1,001,000	$ (1,140,000)	$ 1,425,000	$ (2,369,000)
Shares underlying stock options not included in the diluted computation	0	240,000	0	240,000