Note 6. Accounting for Stock-based Compensation (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	24,000	40,000
Allocated Share-based Compensation Expense	$ 20,000	$ 49,000	$ 82,000	$ 161,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	0	136,000	150,000