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Stock Options, Stock Grants and New Stock (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2016 | May. 12, 2015 | Feb. 10, 2015 | Jan. 05, 2015 | Nov. 21, 2014 | Oct. 16, 2014 | Apr. 24, 2014 | Feb. 20, 2014 | Apr. 25, 2013 | Feb. 07, 2013 | Dec. 31, 2015 | Jan. 03, 2015 | Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted, weighted average fair value (dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 6.57 | $ 6.76 | $ 7.19
Exercised (shares) |  |  |  |  |  |  |  |  |  |  | 666 | 17,074 | 15,247
Shares of common stock purchased |  |  |  |  |  |  |  |  |  |  | 100,400 |  |
Options exercisable (shares) |  |  |  |  |  |  |  |  |  |  | 88,025 |  |
Options exercisable, weighted average exercise price (dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 11.85 |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 521,695 | $ 364,157 | $ 331,362
Issuance of shares of common stock from the treasury (in shares) |  |  |  |  |  |  |  |  |  |  | 26,118 | 14,522 | 17,572
Issuance of common stock (shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 2,300,000
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (shares) |  |  |  |  |  |  |  |  |  |  | 666 | 17,074 | 15,247
Option exercises, aggregate exercise price |  |  |  |  |  |  |  |  |  |  | $ 8,000 | $ 192,000 | $ 163,000
Cash received from exercise of stock options |  |  |  |  |  |  |  |  |  |  | $ 8,000 | $ 42,000 | $ 138,000
Shares of common stock purchased |  |  |  |  |  |  |  |  |  |  |  | 9,094 | 1,752
Stock repurchased during year |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 | $ 25,000
Options exercisable (shares) |  |  |  |  |  |  |  |  |  |  | 88,025 | 56,787 | 40,591
Options exercisable, weighted average exercise price (dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 11.85 | $ 11.73 | $ 11.26
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 278,000 | $ 261,000 | $ 249,000
Total unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  | $ 319,000 |  |
Share-based compensation, weighted average period of recognition (years) |  |  |  |  |  |  |  |  |  |  | 3 years 2 days |  |
2011 Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (shares) |  |  | 32,532 |  |  |  |  | 13,790 |  | 40,594 |  |  |
Options granted, weighted average exercise price (dollars per share) |  |  | $ 16.01 |  |  |  |  | $ 14.76 |  | $ 13.70 |  |  |
Options granted, weighted average fair value (dollars per share) |  |  | $ 6.39 |  |  |  |  | $ 6.70 |  | $ 6.30 |  |  |
Risk free interest rate (percent) |  |  | 2.00% |  |  |  |  | 2.00% |  | 2.00% |  |  |
Expected volatility rate (percent) |  |  | 46.00% |  |  |  |  | 52.00% |  | 53.00% |  |  |
Expected life (years) |  |  | 7 years |  |  |  |  | 7 years |  | 7 years |  |  |
Expected dividend yield (percent) |  |  | 2.00% |  |  |  |  | 1.80% |  | 1.80% |  |  |
Annual vesting rate (percent) |  |  | 20.00% |  |  |  |  |  |  |  |  |  |
2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate (percent) |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 243,000 | 103,000 | 82,000
Total unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  | $ 711,000 |  |
Share-based compensation, weighted average period of recognition (years) |  |  |  |  |  |  |  |  |  |  | 3 years 9 months 27 days |  |
Period after grant date, awards vesting begins (years) |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Share-based compensation expense, period of recognition (years) |  |  |  |  |  |  |  |  |  |  | 60 months |  |
Share-based compensation expense, net of taxes |  |  |  |  |  |  |  |  |  |  | $ 155,000 | $ 66,000 | $ 52,000
Share-based compensation expense, net of taxes, (dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.01 | $ 0.01
2015 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate (percent) |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Period after grant date, awards vesting begins (years) |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  |  |  |  |  |  |  |  | 250,000 |  |
External Consultants [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Granted, weighted average grant date fair value (dollars per share) |  |  |  | $ 17.95 |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  | 31,080 |  |  |  |  |  |  |
Granted, weighted average grant date fair value (dollars per share) |  |  |  |  |  | $ 15.69 |  |  |  |  |  |  |
Non Employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock from the treasury (in shares) |  | 8,216 |  |  |  |  | 7,088 |  | 9,411 |  |  |  |
Annual cash retainer fees |  | $ 119,000 |  |  |  |  | $ 111,000 |  | $ 128,000 |  |  |  |
Restricted Stock [Member] | Non Employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual retainer percent |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Specialty Pipe And Tube, Inc. [Member] | Certain Management Employees [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  | 23,665 |  |  |  |  |  |  |  |
Granted, weighted average grant date fair value (dollars per share) |  |  |  |  | $ 15.85 |  |  |  |  |  |  |  |
Subsequent Event [Member] | 2015 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate (percent) | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) | 50,062 |  |  |  |  |  |  |  |  |  |  |  |
Granted, weighted average grant date fair value (dollars per share) | $ 7.51 |  |  |  |  |  |  |  |  |  |  |  |
Period after grant date, awards vesting begins (years) | 1 year |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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