Annual report pursuant to Section 13 and 15(d)

EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Stock Options Outstanding (Details)

v3.20.4
EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Stock Options Outstanding (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Number Outstanding 465,500
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 3 years 3 months
Options Outstanding - Number Exercisable 455,300
Exercise Price One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 2.00
Options Outstanding - Number Outstanding 395,000
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 2 years 11 months 1 day
Options Outstanding - Number Exercisable 395,000
Exercise Price Three [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 5.50
Options Outstanding - Number Outstanding 5,000
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 2 years 2 months 12 days
Options Outstanding - Number Exercisable 5,000
Exercise Price Six [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 14.54
Options Outstanding - Number Outstanding 10,000
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 3 years 8 months 23 days
Options Outstanding - Number Exercisable 10,000
Exercise Price Seven [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 8.00
Options Outstanding - Number Outstanding 4,500
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 3 years 11 months 1 day
Options Outstanding - Number Exercisable 4,500
Exercise Price Nine [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 6.42
Options Outstanding - Number Outstanding 15,000
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 5 years 4 months 2 days
Options Outstanding - Number Exercisable 12,000
Exercise Price Ten [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding - Exercise price | $ / shares $ 11.75
Options Outstanding - Number Outstanding 36,000
Options Outstanding - Weighted-Average Remaining Contractual Life (in years) 5 years 11 months 12 days
Options Outstanding - Number Exercisable 28,800