XML 37 R26.htm IDEA: XBRL DOCUMENT
v3.20.2

Stock Options (Tables) | 3 Months Ended
--- | ---
Sep. 30, 2020
2012 Employee Stock Option Plan [Member] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | ​
​ | ​ | ​ | ​
​ | ​ | 2019 |
Risk-free interest rates | ​ | 2.10 | %
Expected lives | ​ | 10 years | ​
Expected volatility | ​ | 46 | %
Expected dividend yields | ​ | 0 | %
​
Schedule of Share-based Compensation, Stock Options, Activity | The following table reflects activity under the 2012 Employee Plan for the three months ended September 30,: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | ​ | 2019
​ | ​ | ​ | ​ | ​ | Weighted average | ​ | ​ | ​ | ​ | Weighted average
​ | ​ | Options |  | exercise price |  | Options |  | exercise price
Outstanding, beginning of year | ​ | ​ | 117,840 | ​ | $ | 18.84 | ​ | ​ | 72,500 | ​ | $ | 11.01
Granted | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,000 | ​ | ​ | 26.06
Exercised | ​ | ​ | — |  | ​ | — | ​ |  | — |  | ​ | —
Outstanding, end of period | ​ | ​ | 117,840 | ​ | $ | 18.84 | ​ |  | 80,500 | ​ | $ | 12.51
Exercisable, end of period | ​ | ​ | 37,400 | ​ | $ | 13.73 | ​ |  | 35,400 | ​ | $ | 8.62
Weighted average fair value at grant date of options granted | ​ | ​ | n/a | ​ |  | ​ | ​ | $ | 15.17 | ​ |  | ​
Total intrinsic value of options exercised | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ |  | ​
Total intrinsic value of options outstanding | ​ | $ | 706,000 | ​ | ​ | ​ | ​ | $ | 1,052,000 | ​ |  | ​
Total intrinsic value of options exercisable | ​ | $ | 399,000 | ​ | ​ | ​ | ​ | $ | 599,000 | ​ |  | ​
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about stock options outstanding under the 2012 Employee Plan at September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options outstanding | ​ | Options exercisable
​ |  | ​ |  | Weighted average |  | ​ | ​ |  | ​ |  | ​ | ​
​ | ​ | Number | ​ | remaining | ​ | Weighted average | ​ | Number | ​ | Weighted average
Range of exercise prices | ​ | outstanding | ​ | contractual life | ​ | exercise price | ​ | exercisable | ​ | exercise price
$4.37‑$33.59 | ​ | 117,840 | ​ | 8.1 | ​ | $ | 18.84 | ​ | 37,400 | ​ | $ | 13.73
​ | ​ | 117,840 | ​ | 8.1 | ​ | $ | 18.84 | ​ | 37,400 | ​ | $ | 13.73
2012 Non-Employee Stock Option Plan [Member] |
Schedule of Share-based Compensation, Stock Options, Activity | The following table reflects activity under the 2012 Non-Employee Plan for the three months ended September 30,: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | ​ | 2019
​ | ​ | ​ | ​ |  | Weighted average |  | ​ | ​ |  | Weighted average
​ | ​ | Options | ​ | exercise price | ​ | Options | ​ | exercise price
Outstanding, beginning of year | ​ | ​ | 12,000 | ​ | $ | 10.29 | ​ | ​ | 10,200 | ​ | $ | 7.99
Granted | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Exercised | ​ | ​ | — |  | ​ | — | ​ |  | — |  | ​ | —
Outstanding, end of period | ​ | ​ | 12,000 | ​ | $ | 10.29 | ​ |  | — | ​ | ​ | —
Exercisable, end of period | ​ | ​ | 5,760 | ​ | $ | 8.35 | ​ |  | 10,200 | ​ | $ | 7.99
Weighted average fair value at grant date of options granted | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ |  |
Total intrinsic value of options exercised | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ |  |
Total intrinsic value of options outstanding | ​ | $ | 159,000 | ​ | ​ | ​ | ​ | $ | 179,000 | ​ |  |
Total intrinsic value of options exercisable | ​ | $ | 87,000 | ​ | ​ | ​ | ​ | $ | 58,000 | ​ |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about stock options outstanding under the 2012 Non-Employee Plan at September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options outstanding | ​ | Options exercisable
​ |  | ​ |  | Weighted average |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number | ​ | remaining | ​ | average exercise | ​ | Number | ​ | average exercise
Range of exercise prices | ​ | outstanding |  | contractual life | ​ | price | ​ | exercisable | ​ | price
$4.37 - $23.35 | ​ | 12,000 | ​ | 7.0 | ​ | $ | 10.29 | ​ | 5,760 | ​ | $ | 8.35
​ | ​ | 12,000 | ​ | 7.0 | ​ | $ | 10.29 | ​ | 5,760 | ​ | $ | 8.35
2018 Non-Employee Stock Option Plan |
Schedule of Share-based Compensation, Stock Options, Activity | The following table reflects activity under the 2018 Non-Employee Plan for the three months ended September 30,: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | ​ | 2019
​ |  | ​ | ​ |  | Weighted average |  | ​ | ​ |  | Weighted average
​ | ​ | Options |  | exercise price | ​ | ​ | Options |  | exercise price
Outstanding, beginning of year | ​ | ​ | 48,400 | ​ | $ | 23.48 | ​ | ​ | 15,200 | ​ | $ | 16.20
Granted | ​ | ​ | — |  | ​ | — | ​ |  | — |  | ​ | —
Exercised | ​ | ​ | — |  | ​ | — | ​ |  | — |  | ​ | —
Outstanding, end of period | ​ | ​ | 48,400 | ​ | $ | 23.48 | ​ |  | 15,200 | ​ | $ | 16.20
Exercisable, end of period | ​ | ​ | 12,240 | ​ | $ | 21.96 | ​ |  | 2,400 | ​ | $ | 16.20
Weighted average fair value at grant date of options granted | ​ | ​ | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​
Total intrinsic value of options exercised | ​ |  | n/a | ​ | ​ | ​ | ​ | ​ | n/a | ​ | ​ | ​
Total intrinsic value of options outstanding | ​ | $ | 114,000 | ​ | ​ | ​ | ​ | $ | 142,000 | ​ | ​ | ​
Total intrinsic value of options exercisable | ​ | $ | 41,000 | ​ | ​ | ​ | ​ | $ | 22,000 | ​ | ​ | ​
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about stock options outstanding under the 2018 Non-Employee Plan at September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options outstanding | ​ | Options exercisable
​ |  | ​ |  | Weighted average |  | Weighted |  | ​ |  | Weighted
​ | ​ | Number | ​ | remaining | ​ | average exercise | ​ | Number | ​ | average exercise
Range of exercise prices | ​ | outstanding | ​ | contractual life | ​ | price | ​ | exercisable | ​ | price
$16.20-$30.54 | ​ | 48,400 |  | 8.9 | ​ | $ | 23.48 |  | 12,240 | ​ | $ | 21.96
​ | ​ | 48,400 |  | 8.9 | ​ | $ | 23.48 |  | 12,240 | ​ | $ | 21.96
2020 Non-Employee Stock Option Plan |
Schedule of Share-based Compensation, Stock Options, Activity | The following table reflects activity under the 2020 Employee Plan for the three months ended September 30,: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | ​ | ​ | ​ | Weighted average
​ |  | Options |  | exercise price
Outstanding, beginning of year |  | ​ | — |  | ​ | —
Granted |  | ​ | 5,000 | ​ | $ | 22.80
Exercised |  | ​ | — | ​ |  | —
Outstanding, end of period |  | ​ | 5,000 | ​ | $ | 22.80
Exercisable, end of period |  | ​ | 1,000 | ​ | $ | 22.80
Weighted average fair value at grant date of options granted | ​ | $ | 12.20 | ​ |  |
Total intrinsic value of options exercised | ​ |  | n/a | ​ |  |
Total intrinsic value of options outstanding | ​ | $ | 4,000 | ​ |  |
Total intrinsic value of options exercisable | ​ | $ | 1,000 | ​ |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about stock options outstanding under the 2012 Employee Plan at September 30, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options outstanding | Options exercisable
​ | ​ | ​ | ​ | Weighted average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number | ​ | remaining | ​ | Weighted average | ​ | Number | ​ | Weighted average
Range of exercise prices |  | outstanding |  | contractual life |  | exercise price | ​ |  | exercisable |  | exercise price | ​
$22.80 |  | 5,000 |  | 9.9 | ​ | $ | 22.80 |  | 1,000 | ​ | $ | 22.80
​ |  | 5,000 |  | 9.9 | ​ | $ | 22.80 |  | 1,000 | ​ | $ | 22.80
Fair Value Measurement Inputs and Valuation Techniques | The fair value of each option granted during the three months ended September 30 was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions: ​
​ | ​ | ​ | ​
​ |  | 2020 |
Risk-free interest rates |  | 0.62 | %
Expected lives |  | 10 years | ​
Expected volatility |  | 45 | %
Expected dividend yields |  | 0 | %
​

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=nssc_Employee2012StockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=nssc_Nonemployee2012StockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=nssc_Nonemployee2018StockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=nssc_Nonemployee2020StockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |