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Note 11 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Beginning |  |  | Granted |  |  | Exercised |  |  | Canceled |  |  | Ending |  |  |  |  |
|  | Balance |  |  | During |  |  | During |  |  | During |  |  | Balance |  |  |  |  |
|  | Outstanding |  |  | Period |  |  | Period |  |  | Period |  |  | Outstanding |  |  | Exercisable |
Year ended December 31, 201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 124,480 |  |  |  | -0- |  |  |  | 64,750 |  |  |  | -0- |  |  |  | 59,730 |  |  |  | 59,730 |
Weighted average exercise price Per share |  | $ | 4.57 |  |  |  | -0- |  |  |  | 4.62 |  |  |  | -0- |  |  | $ | 4.51 |  |  | $ | 4.51 |
Year ended December 31, 201 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 59,730 |  |  |  | -0- |  |  |  | 36,800 |  |  |  | -0- |  |  |  | 22,930 |  |  |  | 22,930 |
Weighted average exercise price Per share |  | $ | 4.51 |  |  |  | -0- |  |  |  | 3.97 |  |  |  | -0- |  |  | $ | 5.36 |  |  | $ | 5.36 |
|  | Beginning |  |  | Granted |  |  | Exercised |  |  | Canceled |  |  | Ending |  |  |  |  |
|  | Balance |  |  | During |  |  | During |  |  | During |  |  | Balance |  |  |  |  |
|  | Outstanding |  |  | Period |  |  | Period |  |  | Period |  |  | Outstanding |  |  | Exercisable |
Year ended December 31, 201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 100,000 |  |  |  | 125,000 |  |  |  | -0- |  |  |  | -0- |  |  |  | 225,000 |  |  |  | 65,000 |
Weighted average exercise price Per share |  | $ | 11.17 |  |  |  | 8.04 |  |  |  | -0- |  |  |  | -0- |  |  | $ | 9.43 |  |  | $ | 9.97 |
Year ended December 31, 201 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 225,000 |  |  |  | 140,000 |  |  |  | -0- |  |  |  | -0- |  |  |  | 365,000 |  |  |  | 185,000 |
Weighted average exercise price Per share |  | $ | 9.43 |  |  |  | 10.82 |  |  |  | -0- |  |  |  | -0- |  |  | $ | 12.35 |  |  | $ | 13.76 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  | Options Outstanding |  |  |  |  |  |  |  |  |  |  | Options Exercisable |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Average |  |  | Average |  |  |  |  |  |  |  |  |  |  | Average |  |  |  |  |
Exercis e |  |  | Number |  |  | Remaining |  |  | Exercise |  |  | Intrinsic |  |  | Number |  |  | Exercise |  |  | Intrinsic |
Price Range |  |  | Outstanding |  |  | Contractual |  |  | Price |  |  | Value |  |  | Exercisable |  |  | Price |  |  | Value |
| $4.00 | - | 7.00 |  |  |  | 15,930 |  |  |  | 2.00 |  |  | $ | 4.25 |  |  | $ | 117,404 |  |  |  | 15,930 |  |  | $ | 4.25 |  |  | $ | 117,404 |
| $7.00 | - | 10.00 |  |  |  | 7,000 |  |  |  | 3.00 |  |  | $ | 7.90 |  |  | $ | 26,040 |  |  |  | 9,800 |  |  | $ | 7.90 |  |  | $ | 26,040 |
| $10.01 | - | 12.00 |  |  |  | 240,000 |  |  |  | 8.3 |  |  | $ | 10.96 |  |  | $ | 158,400 |  |  |  | 65,000 |  |  | $ | 11.17 |  |  | $ | 27,000 |
| $12.01 | - | 15.00 |  |  |  | 125,000 |  |  |  | 4.5 |  |  | $ | 15.00 |  |  | $ | 0 |  |  |  | 125,000 |  |  | $ | 15.00 |  |  | $ | 0 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Shares of |  |  | Average Grant |
|  | Restricted |  |  | Date Fair |
|  | Stock |  |  | Value |
Unvested outstanding at January 1, 2016 |  |  | 4,000 |  |  | $ | 10.97 |
Granted |  |  | 17,524 |  |  | $ | 8.45 |
Vested |  |  | (21,524 | ) |  | $ | 12.84 |
Forfeited/Cancelled |  |  | - |  |  |  |  |
Unvested outstanding at December 31, 201 6 |  |  | 0 |  |  | $ | 0 |
Granted |  |  | 9,300 |  |  | $ | 9.70 |
Vested |  |  | (9,300 | ) |  | $ | 9.70 |
Forfeited/Cancelled |  |  | - |  |  |  |  |
Unvested outstanding at December 31, 201 7 |  |  | -0- |  |  | $ |  |
|  |  |  |  |  | Weighted |
|  | Shares of |  |  | Average Grant |
|  | Restricted |  |  | Date Fair |
|  | Stock Units |  |  | Value |
Unvested outstanding at January 1, 201 6 |  |  | 94,580 |  |  | $ | 12.55 |
Granted |  |  | 60,400 |  |  | $ | 8.56 |
Vested |  |  | (33,890 | ) |  | $ | 12.43 |
Forfeited/Cancelled |  |  | (7,000 | ) |  | $ | 11.68 |
Unvested outstanding at December 31, 201 6 |  |  | 114,090 |  |  | $ | 10.47 |
Granted |  |  | 39,720 |  |  | $ | 10.88 |
Vested |  |  | (58,776 | ) |  | $ | 10.83 |
Forfeited/Cancelled |  |  | (125 | ) |  | $ | 14.61 |
Unvested outstanding at December 31, 201 7 |  |  | 94,909 |  |  | $ | 10.43 |

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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