Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, accounts receivable current	$ 67,000	$ 87,000
Allowance for doubtful accounts, financial receivables current	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued
Common stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	19,178,000	18,327,000
Common stock, shares outstanding	18,166,000	17,440,000
Treasury stock, shares	1,012,000	887,000